latent heat vs heat energy

latent heat and heat energy both are nouns.

Word	Noun	Adjective	Verb	Adverb
latent heat	Yes	No	No	No
heat energy	Yes	No	No	No

As nouns, heat energy is a hypernym of latent heat; that is, heat energy is a word with a broader meaning than latent heat:

latent heat: heat absorbed or radiated during a change of phase at a constant temperature and pressure
heat energy: a form of energy that is transferred by a difference in temperature

Other hypernyms of latent heat include heat.

latent heat (noun)	heat energy (noun)
heat absorbed or radiated during a change of phase at a constant temperature and pressure	a form of energy that is transferred by a difference in temperature