It is hard to count the number of words in any language because most words are used infrequently, and many are used so infrequently that it is hard to know whether they should really be included. A good example would be the technical vocabulary of any profession. Most English speakers, even very-well educated speakers, would have trouble stating which of these are real English words, and, if real, what they mean: Usufruct, pedicellarium, phalanstery, praxitometry, coqueliquot, deadrise, sassigassity. "Sassigassity" apparently has only been used once in the entire history of the English language--except in discussion of the word "sassigassity." But it was used by Charles Dickens, a famous and well-known author. Should it count as an English word? What about words like "usufruct," that most lawyers know, but most English speakers who are not lawyers do not know? So a major problem in English is whether it really has more words than other languages, or whether English lexicographers (compilers of dictionaries) are simply harder-working, or less discriminating, and more apt to include every word they can without questioning how often it is really used. The tradition, as set by the encyclopedia-sized Oxford English Dictionary, is to record every word possible and citations of use, with making judgements about whether they deserve to be included. English has a rich vocabulary due to drawing from two main sources, Anglo-Saxon or Germanic derived, and Latin-derived (often by way of Norman French). So we have many pairs like belly/abdomen, light/illumination, heavy/ponderous, hellish/infernal, horseman/equestrian, brain/cerebrum, etc. etc. That probably increases the count. English can't be the only such language, but I don't know the others. English has also be free from any attempt to keep the language pure, and happily borrows words form dozen of other languages. P.S "Praxitometry" is not a real word; the others are.

Short answer: Possibly. :-) Long answer (https://en.oxforddictionaries.com/explore/does-english-have-most-words): This question is practically impossible to answer, for the reasons explained in the answer to How many words are there in the English language? However, it seems quite probable that English has more words than most comparable world languages. The reason for this is historical. English was originally a Germanic language, related to Dutch and German, and it shares much of its grammar and basic vocabulary with those languages. However, after the Norman Conquest in 1066 it was hugely influenced by Norman French, which became the language of the ruling class for a considerable period, and by Latin, which was the language of scholarship and of the Church. Very large numbers of French and Latin words entered the language. Consequently, English has a much larger vocabulary than either the Germanic languages or the members of the Romance language family to which French belongs. English is also very ready to accommodate foreign words, and as it has become an international language, it has absorbed vocabulary from a large number of other sources. This does, of course, assume that you ignore 'agglutinative' languages such as Finnish, in which words can be stuck together in long strings of indefinite length, and which therefore have an almost infinite number of 'words'. Hope this helps!