limner vs portrait painter

limner and portrait painter both are nouns.

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

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

Other synonyms of limner include portraitist, portrayer.

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