fell vs elapse

fell is a noun but elapse is not a noun.

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

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

Other hypernyms of fell include glide by, go along, go by, lapse, pass, slide by, slip away, slip by.

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

fell (verb)	elapse (verb)
cause to fall by or as if by delivering a blow	for time to move forward
sew a seam by folding the edges
pass away rapidly