enthalpy vs total heat

enthalpy and total heat both are nouns.

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

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

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

Other synonyms of enthalpy include H, heat content.

enthalpy (noun)	total heat (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