slow down vs bog

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

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

As verbs, bog is a hyponym of slow down; that is, bog is a word with a more specific, narrower meaning than slow down:

Other hyponyms of slow down include bog down, clog, constipate.

slow down (noun)	bog (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

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