coincide vs overlap

coincide is not a noun while overlap is a noun.

Word	Noun	Adjective	Verb	Adverb
coincide	No	No	Yes	No
overlap	Yes	No	Yes	No

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

coincide (noun)	overlap (noun)
	a flap that lies over another part
	the property of partial coincidence in time
	a representation of common ground between theories or phenomena

coincide (verb)	overlap (verb)
happen simultaneously	extend over and cover a part of
go with, fall together	coincide partially or wholly
be the same