collation vs repast

collation and repast both are nouns.

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

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

Other hypernyms of collation include meal.

collation (noun)	repast (noun)
careful examination and comparison to note points of disagreement	the food served and eaten at one time
assembling in proper numerical or logical sequence
a light informal meal