fill up vs coapt

fill up and coapt both are verbs.

Word	Noun	Adjective	Verb	Adverb
fill up	No	No	Yes	No
coapt	No	No	Yes	No

As verbs, coapt is a hyponym of fill up; that is, coapt is a word with a more specific, narrower meaning than fill up:

Other hyponyms of fill up include seal, plug, secure, stop up, conglutinate.

fill up (verb)	coapt (verb)
make full, also in a metaphorical sense	fit tightly and fasten
become full	cause to adhere
eat until one is sated
fill or stop up