Pianola vs mechanical piano

Pianola and mechanical piano both are nouns.

Word	Noun	Adjective	Verb	Adverb
Pianola	Yes	No	No	No
mechanical piano	Yes	No	No	No

As nouns, Pianola and mechanical piano are synonyms defined as:

Pianola and mechanical piano: a mechanically operated piano that uses a roll of perforated paper to activate the keys

Other synonyms of Pianola include player piano.

Pianola (noun)	mechanical piano (noun)
a mechanically operated piano that uses a roll of perforated paper to activate the keys	a mechanically operated piano that uses a roll of perforated paper to activate the keys