parlor grand piano vs parlor grand

parlor grand piano and parlor grand both are nouns.

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

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

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

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