hautboy vs basset oboe

hautboy and basset oboe both are nouns.

Word	Noun	Adjective	Verb	Adverb
hautboy	Yes	No	No	No
basset oboe	Yes	No	No	No

As nouns, basset oboe is a hyponym of hautboy; that is, basset oboe 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
basset oboe: an oboe pitched an octave below the ordinary oboe

Other hyponyms of hautboy include heckelphone, musette pipe, oboe da caccia, oboe d'amore, shawm.

hautboy (noun)	basset oboe (noun)
a slender double-reed instrument; a woodwind with a conical bore and a double-reed mouthpiece	an oboe pitched an octave below the ordinary oboe