parlor grand vs baby grand piano

parlor grand and baby grand piano both are nouns.

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

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

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

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