impress vs sweep away

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

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

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

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

impress (verb)	sweep away (verb)
dye (fabric) before it is spun	eliminate completely and without a trace
produce or try to produce a vivid impression of	overwhelm emotionally
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