overlay vs overlie

overlay is a noun but overlie is not a noun.

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

As verbs, overlay and overlie are synonyms defined as:

overlay (noun)	overlie (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

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