forte-piano vs grand

forte-piano and grand both are nouns.

Word	Noun	Adjective	Verb	Adverb
forte-piano	Yes	No	No	No
grand	Yes	Yes	No	No

As nouns, grand is a hyponym of forte-piano; that is, grand is a word with a more specific, narrower meaning than forte-piano:

forte-piano: a keyboard instrument that is played by depressing keys that cause hammers to strike tuned strings and produce sounds
grand: a piano with the strings on a horizontal harp-shaped frame; usually supported by three legs

Other hyponyms of forte-piano include grand piano, mechanical piano, Pianola, player piano, upright, upright piano.

forte-piano (noun)	grand (noun)
a keyboard instrument that is played by depressing keys that cause hammers to strike tuned strings and produce sounds	a piano with the strings on a horizontal harp-shaped frame; usually supported by three legs
	the cardinal number that is the product of 10 and 100

forte-piano (adjective)	grand (adjective)
	used of a person's appearance or behavior; befitting an eminent person
	extraordinarily good or great; used especially as intensifiers
	the most important and magnificent in adornment
	of behavior that is impressive and ambitious in scale or scope
	large and impressive in physical size or extent
	of high moral or intellectual value; elevated in nature or style
	of or befitting a lord
	ostentatiously rich and superior in quality