Hyperthermic is an adjective. The adjective is the word that accompanies the noun to determine or qualify it.

What does hyperthermic mean?

(HY-per-THER-mee-uh) Abnormally high body temperature. This may be caused as part of treatment, by an infection, or by exposure to heat.

Is hypothermic a word?

Affected by hypothermia; having an abnormally low body temperature. The survivors of the shipwreck quickly became hypothermic.