prayer vs pray

prayer is a noun but pray is not a noun.

Word	Noun	Adjective	Verb	Adverb
prayer	Yes	No	No	No
pray	No	No	Yes	No

prayer (noun)	pray (noun)
the act of communicating with a deity (especially as a petition or in adoration or contrition or thanksgiving)
earnest or urgent request
a fixed text used in praying
reverent petition to a deity
someone who prays to God

prayer (verb)	pray (verb)
	address a deity, a prophet, a saint or an object of worship; say a prayer
	call upon in supplication; entreat