What's the difference between a chant and a hymn?

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Answer

These are examples of what I think of when I hear the words "chant" and "hymn:"

An example of Gregorian chant: "Dies Irae"
https://www.youtube.com/watch?v=Dlr90NLDp-0

Hymn: "A Mighty Fortress Is Our God"
https://www.youtube.com/watch?v=ADamVJaXZMg

Answer

Chant: (noun) a repeated rhythmic phrase, usually shouted by a crowd

Hymn: (noun) a religious song or poem

Answer

A chant is a tuneless repetition of some words over and over (usually in a religious ceremony).
A hymn is a religious song sung in a church.It has a melody,whereas a chant usually has no melody and is monotonous,and has only a few words that are just repeated.