parlour grand vs baby grand piano

parlour grand and baby grand piano both are nouns.

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

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

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

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