portrayer vs portrait painter

portrayer and portrait painter both are nouns.

Word	Noun	Adjective	Verb	Adverb
portrayer	Yes	No	No	No
portrait painter	Yes	No	No	No

As nouns, portrayer and portrait painter are synonyms defined as:

Other synonyms of portrayer include limner, portraitist.

portrayer (noun)	portrait painter (noun)
a painter or drawer of portraits	a painter or drawer of portraits