obstruct vs close up

obstruct and close up both are verbs.

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

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

Other synonyms of obstruct include block, impede, jam, obturate, occlude.

obstruct (verb)	close up (verb)
block passage through	refuse to talk or stop talking; fall silent
shut out from view or get in the way so as to hide from sight	block passage through
hinder or prevent the progress or accomplishment of	unite or bring into contact or bring together the edges of
	cease to operate or cause to cease operating

obstruct (adverb)	close up (adverb)
	very close