round off vs modify

round off and modify both are verbs.

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

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

Other hypernyms of round off include alter, change.

round off (verb)	modify (verb)
express as a round number	make less severe or harsh or extreme
make round	add a modifier to a constituent
bring to a highly developed, finished, or refined state	cause to change; make different; cause a transformation