oboe vs oboe da caccia

oboe and oboe da caccia both are nouns.

Word	Noun	Adjective	Verb	Adverb
oboe	Yes	No	No	No
oboe da caccia	Yes	No	No	No

As nouns, oboe da caccia is a hyponym of oboe; that is, oboe da caccia is a word with a more specific, narrower meaning than oboe:

oboe: a slender double-reed instrument; a woodwind with a conical bore and a double-reed mouthpiece
oboe da caccia: an alto oboe; precursor of the English horn

Other hyponyms of oboe include basset oboe, heckelphone, musette pipe, oboe d'amore, shawm.

oboe (noun)	oboe da caccia (noun)
a slender double-reed instrument; a woodwind with a conical bore and a double-reed mouthpiece	an alto oboe; precursor of the English horn