minor planet vs KBO

minor planet and KBO both are nouns.

Word	Noun	Adjective	Verb	Adverb
minor planet	Yes	No	No	No
KBO	Yes	No	No	No

As nouns, KBO is a hyponym of minor planet; that is, KBO is a word with a more specific, narrower meaning than minor planet:

minor planet: any of numerous small celestial bodies that move around the sun
KBO: any of many minor planets in the Kuiper belt outside the orbit of Neptune at the edge of the solar system

Other hyponyms of minor planet include asteroid, Kuiper belt object.

minor planet (noun)	KBO (noun)
any of numerous small celestial bodies that move around the sun	any of many minor planets in the Kuiper belt outside the orbit of Neptune at the edge of the solar system