hautboy vs oboe d'amore

hautboy and oboe d'amore both are nouns.

Word	Noun	Adjective	Verb	Adverb
hautboy	Yes	No	No	No
oboe d'amore	Yes	No	No	No

As nouns, oboe d'amore is a hyponym of hautboy; that is, oboe d'amore is a word with a more specific, narrower meaning than hautboy:

hautboy: a slender double-reed instrument; a woodwind with a conical bore and a double-reed mouthpiece
oboe d'amore: an oboe pitched a minor third lower than the ordinary oboe; used to perform baroque music

Other hyponyms of hautboy include basset oboe, heckelphone, musette pipe, oboe da caccia, shawm.

hautboy (noun)	oboe d'amore (noun)
a slender double-reed instrument; a woodwind with a conical bore and a double-reed mouthpiece	an oboe pitched a minor third lower than the ordinary oboe; used to perform baroque music