close up vs impede

close up and impede both are verbs.

Word	Noun	Adjective	Verb	Adverb
close up	No	No	Yes	Yes
impede	No	No	Yes	No

As verbs, close up and impede are synonyms defined as:

Other synonyms of close up include block, jam, obstruct, obturate, occlude.

As verbs, impede is a hypernym of close up; that is, impede is a word with a broader meaning than close up:

Other hypernyms of close up include hinder.

close up (verb)	impede (verb)
refuse to talk or stop talking; fall silent	block passage through
block passage through	be a hindrance or obstacle to
unite or bring into contact or bring together the edges of
cease to operate or cause to cease operating

close up (adverb)	impede (adverb)
very close