planetoid vs KBO

planetoid and KBO both are nouns.

Word	Noun	Adjective	Verb	Adverb
planetoid	Yes	No	No	No
KBO	Yes	No	No	No

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

planetoid: 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 planetoid include asteroid, Kuiper belt object.

planetoid (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