clog vs slow up

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

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

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

Other hypernyms of clog include slow, slow down.

clog (noun)	slow 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)	slow up (verb)
impede with a clog or as if with a clog	lose velocity; move more slowly
fill to excess so that function is impaired	cause to proceed more slowly
coalesce or unite in a mass	become slow or slower
become or cause to become obstructed
impede the motion of, as with a chain or a burden
dance a clog dance