Nouns

(n)thermalrising current of warm air

Adjectives

(a)thermal, thermic, caloricrelating to or associated with heat“thermal movements of molecules”, “thermal capacity”, “thermic energy”, “the caloric effect of sunlight”
(a)thermalof or relating to a hot spring“thermal water”
(s)thermalcaused by or designed to retain heat“a thermal burn”, “thermal underwear”