heat capacity ratio vs adiabatic index

heat capacity ratio and adiabatic index both are nouns.

Word	Noun	Adjective	Verb	Adverb
heat capacity ratio	Yes	No	No	No
adiabatic index	Yes	No	No	No

As nouns, heat capacity ratio and adiabatic index are synonyms defined as:

heat capacity ratio and adiabatic index: the ratio of the heat capacity at constant pressure (C_P) to heat capacity at constant volume (C_V).

heat capacity ratio (noun)	adiabatic index (noun)
the ratio of the heat capacity at constant pressure (C_P) to heat capacity at constant volume (C_V).	the ratio of the heat capacity at constant pressure (C_P) to heat capacity at constant volume (C_V).