refreshment vs collation

refreshment and collation both are nouns.

Word	Noun	Adjective	Verb	Adverb
refreshment	Yes	No	No	No
collation	Yes	No	No	No

As nouns, collation is a hypernym of refreshment; that is, collation is a word with a broader meaning than refreshment:

Other hypernyms of refreshment include bite, snack.

refreshment (noun)	collation (noun)
activity that refreshes and recreates; activity that renews your health and spirits by enjoyment and relaxation	careful examination and comparison to note points of disagreement
snacks and drinks served as a light meal	assembling in proper numerical or logical sequence
	a light informal meal