Here are some examples of words using this root:
* θερμός (thermos) - hot, warm
* θερμοκρασία (thermokrasia) - temperature
* θερμοπυλές (Thermopylae) - a hot gate (referring to a place in Greece where the water is naturally hot)
* θερμίδες (thermides) - calories (units of heat)
You'll find this root used in many scientific and medical terms related to heat and temperature.