round off vs round down

round off and round down both are verbs.

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

As verbs, round off and round down are synonyms defined as:

Other synonyms of round off include round, round out.

round off (verb)	round down (verb)
express as a round number	express as a round number
make round
bring to a highly developed, finished, or refined state