crap up vs obstruct

crap up and obstruct both are verbs.

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

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

Other hypernyms of crap up include block, close up, impede, jam, obturate, occlude.

crap up (verb)	obstruct (verb)
become or cause to become obstructed	block passage through
	shut out from view or get in the way so as to hide from sight
	hinder or prevent the progress or accomplishment of