Do you feel happy whenever you learn new English words? If so, you are going to love this guide as it carries some of the longest words in the English language. These words may scare you at first but learning them is worthwhile.

The longest word in English is 189,819 letters long and takes 3 hours to say. This is a technical term for the chemical composition of titin. Titin is the largest known protein that is responsible for the muscles’ passive elasticity.

This word is so long because titin is made up of 244 individual protein domains that are linked together in a single sequence. Imagine 244 chemical compound names stuffed into a single word. Let us show you a glimpse of the longest word:


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The longest word in the English dictionary

While the above-mentioned monster is the longest word in English, it’s debatable whether it’s even a word, which is why it’s not listed in any English dictionary. In that case, what’s the longest word in the English language dictionary? It’s pneumonoultramicroscopicsilicovolcanoconiosis.

The irony is that pneumonoultramicroscopicsilicovolcanoconiosis isn’t even a real word! It’s a term invented by Everett M. Smith, president of the National Puzzlers’ League. Everett coined this term as a sarcastic term for long medical terms as well as a synonym for silicosis, a lung disease caused by inhaling sand and ash dust.

Pneumonoultramicroscopicsilicovolcanoconiosis is a collection of Latin terms that describe an inflammatory lung disease caused by long-term silica dust inhalation. While the term is made up, the disease is real and is known in the United Kingdom as pneumoconiosis, silicosis, or black lung.

Let’s dissect this longest word in English to make you understand its pronunciation.

Pneumono-A prefix meaning “lung”
MicroscopicVery tiny; seen only with a microscope
SilicaA dioxide of silicon that occurs as quartz sand
VolcanoA vent in the earth’s crust or a mountain crater where lava is expelled
PneumonoconiosisA lung disease

Here’s the phonetic respelling:

  • nyoo-muh-noh-uhl-truh-mahy-kruh-skop-ik-sil-i-koh-vol-key-noh-koh-nee-oh-sis.

You can use English dictionary apps to understand the meaning of such words. These dictionary apps serve as a great tool to enrich the vocabulary list of English learners. Now, let’s move towards 15 other words that are also long enough to scare an innocent person.

While most of them are technical terms, you will probably find a way to use “floccinaucinihilipilification” or “xenotransplantation” in a conversation.

WordMeaningLetter count
PneumonoultramicroscopicsilicovolcanoconiosisA specific lung disease caused by inhaling quartz dust.45
HippopotomonstrosesquippedaliophobiaA fear of long words.36
PseudopseudohypoparathyroidismA medical condition of the thyroid30
SupercalifragilisticexpialidociousAn expression of excitement.34
EellogofusciouhipoppokunuriousVery good, very fine30
FloccinaucinihilipilificationEstimating something as worthless29
AntidisestablishmentarianismOpposition to the disestablishment of the Church of England28
HonorificabilitudinitatibusThe state of being able to achieve honors27
ThyroparathyroidectomizedA medical term that describes the excision of the thyroid and parathyroid glands.25
DichlorodifluoromethaneA chlorofluoromethane CF2Cl223
XenotransplantationThe process of transplanting organs from one species to another19
IncomprehensibilitiesThings that are impossible to comprehend21
TrichotillomaniaAn inexplicable desire to pull your own hair16
UncopyrightableImpossible to be protected by copyrights15
TergiversationWhen someone avoids making a clear statement14

Looking at these giant words actually makes a person think that how many words are there in English language? That curiosity is natural. But remember, mastering a second language is a gradual process. You need to learn new words at a gradual pace and most importantly, speak them as much as possible. Speaking is the key to master new words their pronunciation.

The longest one-syllable word in English

The majority of the longest words in English are technical or medical terms composed of a series of individual parts. However, there are some unusually long words with only one syllable.

The verb screeched, which means “made a loud, squealing noise,” is the most commonly used one-syllable English word. However, other one-syllable words with 9 letters are mentioned in the English dictionary.

  • Schlepped
  • Scratched
  • Scrounged
  • Scrunched
  • Stretched
  • Straights
  • Strengths

The longest English word without vowels

If you are wondering what the longest English word without vowels is, we’re afraid there isn’t one. The answer is determined by whether the “y” is considered a consonant or a vowel. However, in most English words, y is a vowel.

Here is a list of the longest words without vowels but including the letter y:

TwyndyllyngsThe word of Welsh origins, meaning twins
SymphysyA fusion of two bodies or parts
RhythmsRepeated patterns of sounds
SprylyAn adverb from the adjective “spry”
SyzygyAn alignment of planets in astrology
CryptsPlaces where people are buried
TrystsClandestine or secret meetings

The longest place names in the English-speaking countries

Have you ever been to Taumatawhakatangi­hangakoauauotamatea­turipukakapikimaunga­horonukupokaiwhen­uakitanatahu? Or Llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch? While these words look as if you fell asleep while pronouncing them, these are actually names of places you can visit.

PlaceLocationLetter Count
Taumatawhakatangi­hangakoauauotamatea­turipukakapikimaunga­horonukupokaiwhen­uakitanatahuA hill in southern Hawke’s Bay in New Zealand85
LlanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogochA name of a town in Wales58
ChargoggagoggmanchauggauggagoggchaubunagungamauggA lake on the border of Connecticut and Massachusetts, USA45
TweebuffelsmeteenskootmorsdoodgeskietfonteinA farm located about 200km west from Pretoria in South Africa44
PekwachnamaykoskwaskwaypinwanikA lake in Manitoba, Canada31
MamungkukumpurangkuntjunyaA hill in South Australia, approximately 108km away from a town called Marla26
BullaunancheathrairaluinnA name of a town in Ireland25
NunathloogagamiutbingoiA name of a beach on the southwestern coast of Alaska, USA23

Frequently asked questions

Q. How to learn the longest words in English?

A. Learning longest words in English may seem difficult but you can learn them using dictionaries and English translations apps. They require a little practice while learning pronunciation.

Q. What is the longest word in English related to?

A. The longest word in English is related to the medical field.


Now that you know the longest words in the English language, you are ready to amaze your friends with your command of the English language and its nuances.

Unless you are planning a trip to Llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch or diagnosing someone with pneumonoultramicroscopicsilicovolcanoconiosis, these words are unlikely to come in handy anytime soon. Nonetheless, we are sure you had a good time learning these words with us. And if you want to learn English in a month, reach out to italki as soon as possible. Register yourself now!

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