ploughman's lunch vs repast

ploughman's lunch and repast both are nouns.

Word	Noun	Adjective	Verb	Adverb
ploughman's lunch	Yes	No	No	No
repast	Yes	No	No	No

As nouns, repast is a hypernym of ploughman's lunch; that is, repast is a word with a broader meaning than ploughman's lunch:

ploughman's lunch: a meal consisting of a sandwich of bread and cheese and a salad
repast: the food served and eaten at one time

Other hypernyms of ploughman's lunch include meal.

ploughman's lunch (noun)	repast (noun)
a meal consisting of a sandwich of bread and cheese and a salad	the food served and eaten at one time