crap up vs congest

crap up and congest both are verbs.

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

As verbs, crap up and congest are synonyms defined as:

Other synonyms of crap up include back up, choke, choke off, clog, clog up, foul.

crap up (verb)	congest (verb)
become or cause to become obstructed	become or cause to become obstructed