bog down vs bog

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

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

As verbs, bog down and bog are synonyms defined as:

As verbs, bog down and bog are synonyms defined as:

bog 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

bog down (verb)	bog (verb)
cause to slow down or get stuck	cause to slow down or get stuck
get stuck while doing something	get stuck while doing something
be unable to move further
cause to get stuck as if in a mire