total heat vs physical property

total heat and physical property both are nouns.

Word	Noun	Adjective	Verb	Adverb
total heat	Yes	No	No	No
physical property	Yes	No	No	No

As nouns, physical property is a hypernym of total heat; that is, physical property is a word with a broader meaning than total heat:

total heat: (thermodynamics) a thermodynamic quantity equal to the internal energy of a system plus the product of its volume and pressure
physical property: any property used to characterize matter and energy and their interactions

total heat (noun)	physical property (noun)
(thermodynamics) a thermodynamic quantity equal to the internal energy of a system plus the product of its volume and pressure	any property used to characterize matter and energy and their interactions