ideal gas vs perfect gas

ideal gas and perfect gas both are nouns.

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

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

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

ideal gas (noun)	perfect 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