Jovian planet vs gas giant

Jovian planet and gas giant both are nouns.

Word	Noun	Adjective	Verb	Adverb
Jovian planet	Yes	No	No	No
gas giant	Yes	No	No	No

As nouns, Jovian planet and gas giant are synonyms defined as:

Jovian planet and gas giant: any of the four outermost planets in the solar system; much larger than Earth and gaseous in nature (like Jupiter)

Jovian planet (noun)	gas giant (noun)
any of the four outermost planets in the solar system; much larger than Earth and gaseous in nature (like Jupiter)	any of the four outermost planets in the solar system; much larger than Earth and gaseous in nature (like Jupiter)