parlor grand vs parlor grand piano

parlor grand and parlor grand piano both are nouns.

Word	Noun	Adjective	Verb	Adverb
parlor grand	Yes	No	No	No
parlor grand piano	Yes	No	No	No

As nouns, parlor grand and parlor grand piano are synonyms defined as:

Other synonyms of parlor grand include baby grand, baby grand piano, parlour grand, parlour grand piano.

parlor grand (noun)	parlor grand piano (noun)
a small grand piano	a small grand piano