elapse vs fell

elapse is not a noun while fell is a noun.

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

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

Other hyponyms of elapse include fly, vanish.

elapse (noun)	fell (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)

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

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