total heat vs enthalpy

total heat and enthalpy both are nouns.

Word	Noun	Adjective	Verb	Adverb
total heat	Yes	No	No	No
enthalpy	Yes	No	No	No

As nouns, total heat and enthalpy are synonyms defined as:

total heat and enthalpy: (thermodynamics) a thermodynamic quantity equal to the internal energy of a system plus the product of its volume and pressure

Other synonyms of total heat include H, heat content.

total heat (noun)	enthalpy (noun)
(thermodynamics) a thermodynamic quantity equal to the internal energy of a system plus the product of its volume and pressure	(thermodynamics) a thermodynamic quantity equal to the internal energy of a system plus the product of its volume and pressure