parlour grand vs parlor grand piano

parlour grand and parlor grand piano both are nouns.

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

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

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

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