round down vs modify

round down and modify both are verbs.

Word	Noun	Adjective	Verb	Adverb
round down	No	No	Yes	No
modify	No	No	Yes	No

As verbs, modify is a hypernym of round down; that is, modify is a word with a broader meaning than round down:

Other hypernyms of round down include alter, change.

round down (verb)	modify (verb)
express as a round number	make less severe or harsh or extreme
	add a modifier to a constituent
	cause to change; make different; cause a transformation