upright vs spinet

upright and spinet both are nouns.

Word	Noun	Adjective	Verb	Adverb
upright	Yes	Yes	No	No
spinet	Yes	No	No	No

As nouns, spinet is a hyponym of upright; that is, spinet is a word with a more specific, narrower meaning than upright:

upright (noun)	spinet (noun)
a piano with a vertical sounding board	early model harpsichord with only one string per note
a vertical structural member as a post or stake	a small and compactly built upright piano

upright (adjective)	spinet (adjective)
upright in position or posture
of moral excellence
in a vertical position; not sloping