Hunter vs diffuse nebula

Hunter and diffuse nebula both are nouns.

Word	Noun	Adjective	Verb	Adverb
Hunter	Yes	No	No	No
diffuse nebula	Yes	No	No	No

As nouns, diffuse nebula is a hypernym of Hunter; that is, diffuse nebula is a word with a broader meaning than Hunter:

Hunter: a constellation on the equator to the east of Taurus; contains Betelgeuse and Rigel
diffuse nebula: a cluster of stars within an intricate cloud of gas and dust

Other hypernyms of Hunter include gaseous nebula.

Hunter (noun)	diffuse nebula (noun)
a constellation on the equator to the east of Taurus; contains Betelgeuse and Rigel	a cluster of stars within an intricate cloud of gas and dust