clear up vs cap off

clear up and cap off both are verbs.

Word	Noun	Adjective	Verb	Adverb
clear up	No	No	Yes	No
cap off	No	No	Yes	No

As verbs, cap off is a hyponym of clear up; that is, cap off is a word with a more specific, narrower meaning than clear up:

clear up (verb)	cap off (verb)
free (the throat) by making a rasping sound	finish or complete, as with some decisive action
finish a task completely
make free from confusion or ambiguity; make clear
make clear and (more) comprehensible
become clear