parlour grand piano vs parlour grand

parlour grand piano and parlour grand both are nouns.

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

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

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

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