pentecostal vs Pentecostal

pentecostal is not a noun while Pentecostal is a noun.

Word	Noun	Adjective	Verb	Adverb
pentecostal	No	Yes	No	No
Pentecostal	Yes	No	No	No

pentecostal (noun)	Pentecostal (noun)
	any member of a Pentecostal religious body

pentecostal (adjective)	Pentecostal (adjective)
of or relating to or occurring at Pentecost
of or relating to or characteristic of any of various Pentecostal religious bodies or their members