perfect gas vs ideal gas

perfect gas and ideal gas both are nouns.

Word	Noun	Adjective	Verb	Adverb
perfect gas	Yes	No	No	No
ideal gas	Yes	No	No	No

As nouns, perfect gas and ideal gas are synonyms defined as:

perfect gas and ideal gas: a hypothetical gas with molecules of negligible size that exert no intermolecular forces

perfect gas (noun)	ideal gas (noun)
a hypothetical gas with molecules of negligible size that exert no intermolecular forces	a hypothetical gas with molecules of negligible size that exert no intermolecular forces