Protestant vs Protestant Church

Protestant and Protestant Church both are nouns.

Word	Noun	Adjective	Verb	Adverb
Protestant	Yes	Yes	No	No
Protestant Church	Yes	No	No	No

As nouns, Protestant and Protestant Church are synonyms defined as:

Protestant and Protestant Church: the Protestant churches and denominations collectively

Protestant (noun)	Protestant Church (noun)
the Protestant churches and denominations collectively	the Protestant churches and denominations collectively
an adherent of Protestantism

Protestant (adjective)	Protestant Church (adjective)
of or relating to Protestants or Protestantism