clog vs fill up

clog is a noun but fill up is not a noun.

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

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

Other hypernyms of clog include fill, make full.

clog (noun)	fill up (noun)
a dance performed while wearing shoes with wooden soles; has heavy stamping steps
any object that acts as a hindrance or obstruction
footwear usually with wooden soles

clog (verb)	fill up (verb)
impede with a clog or as if with a clog	make full, also in a metaphorical sense
fill to excess so that function is impaired	become full
coalesce or unite in a mass	eat until one is sated
become or cause to become obstructed	fill or stop up
impede the motion of, as with a chain or a burden
dance a clog dance