impress vs sweep off

impress is a noun but sweep off is not a noun.

Word	Noun	Adjective	Verb	Adverb
impress	Yes	No	Yes	No
sweep off	No	No	Yes	No

As verbs, sweep off is a hyponym of impress; that is, sweep off is a word with a more specific, narrower meaning than impress:

impress (noun)	sweep off (noun)
the act of coercing someone into government service

impress (verb)	sweep off (verb)
dye (fabric) before it is spun	overwhelm emotionally
produce or try to produce a vivid impression of
mark or stamp with or as if with pressure
take (someone) against his will for compulsory service, especially on board a ship
reproduce by printing
impress positively
have an emotional or cognitive impact upon