mechanical piano vs Pianola

mechanical piano and Pianola both are nouns.

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

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

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

Other synonyms of mechanical piano include player piano.

mechanical piano (noun)	Pianola (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