hunt down vs fowl

hunt down is not a noun while fowl is a noun.

Word	Noun	Adjective	Verb	Adverb
hunt down	No	No	Yes	No
fowl	Yes	No	Yes	No

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

hunt down (noun)	fowl (noun)
	a domesticated gallinaceous bird thought to be descended from the red jungle fowl
	the flesh of a bird or fowl (wild or domestic) used as food

hunt down (verb)	fowl (verb)
pursue for food or sport (as of wild animals)	hunt fowl in the forest
	hunt fowl