overlie vs overlay

overlie is not a noun while overlay is a noun.

Word	Noun	Adjective	Verb	Adverb
overlie	No	No	Yes	No
overlay	Yes	No	Yes	No

As verbs, overlie and overlay are synonyms defined as:

overlie (noun)	overlay (noun)
	protective covering consisting, for example, of a layer of boards applied to the studs and joists of a building to strengthen it and serve as a foundation for a weatherproof exterior
	a layer of decorative material (such as gold leaf or wood veneer) applied over a surface

overlie (verb)	overlay (verb)
kill by lying on	put something on top of something else
lie upon; lie on top of	kill by lying on