Neptune vs superior planet

Neptune and superior planet both are nouns.

Word	Noun	Adjective	Verb	Adverb
Neptune	Yes	No	No	No
superior planet	Yes	No	No	No

Neptune (noun)	superior planet (noun)
a giant planet with a ring of ice particles; the 8th planet from the sun is the most remote of the gas giants	any of the planets whose orbit lies outside the earth's orbit
(Roman mythology) god of the sea; counterpart of Greek Poseidon