fell vs sew

fell is a noun but sew is not a noun.

Word	Noun	Adjective	Verb	Adverb
fell	Yes	Yes	Yes	No
sew	No	No	Yes	No

As verbs, sew is a hypernym of fell; that is, sew is a word with a broader meaning than fell:

Other hypernyms of fell include run up, sew together, stitch.

fell (noun)	sew (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)	sew (adjective)
(of persons or their actions) able or disposed to inflict pain or suffering

fell (verb)	sew (verb)
cause to fall by or as if by delivering a blow	fasten by sewing; do needlework
sew a seam by folding the edges	create (clothes) with cloth
pass away rapidly