bog vs slow down

bog is a noun but slow down is not a noun.

Word	Noun	Adjective	Verb	Adverb
bog	Yes	No	Yes	No
slow down	No	No	Yes	No

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

Other hypernyms of bog include slow, slow up.

bog (noun)	slow down (noun)
wet spongy ground of decomposing vegetation; has poorer drainage than a swamp; soil is unfit for cultivation but can be cut and dried and used for fuel

bog (verb)	slow down (verb)
cause to slow down or get stuck	become less tense, rest, or take one's ease
get stuck while doing something	lose velocity; move more slowly
	become slow or slower
	reduce the speed of
	cause to proceed more slowly