fell vs chop down

fell is a noun but chop down is not a noun.

Word	Noun	Adjective	Verb	Adverb
fell	Yes	Yes	Yes	No
chop down	No	No	Yes	No

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

Other hyponyms of fell include poleax, poleaxe, log, lumber, cut.

fell (noun)	chop down (noun)
the act of felling something (as a tree)
seam made by turning under or folding together and stitching the seamed materials to avoid rough edges
the dressed skin of an animal (especially a large animal)

fell (adjective)	chop down (adjective)
(of persons or their actions) able or disposed to inflict pain or suffering

fell (verb)	chop down (verb)
cause to fall by or as if by delivering a blow	cut down
sew a seam by folding the edges
pass away rapidly