General:
* Thermodynamics
* Thermochemistry
* Thermal
* Thermometry
* Thermostat
* Thermopile
* Thermoplastic
* Thermoset
* Thermoluminescence
Specific to Energy:
* Therms
* Thermal energy
* Thermal efficiency
* Thermal power
* Thermal conductivity
* Thermal expansion
* Thermal insulation
Specific to Heat:
* Thermal mass
* Thermal capacity
* Thermal transfer
* Thermal shock
* Thermal equilibrium
Other:
* Thermoelectric
* Thermos
* Thermometer
* Thermal imaging
* Thermal analysis
Example Sentences:
* The principles of thermodynamics govern the behavior of energy and its transformations.
* The thermal efficiency of a power plant measures how effectively it converts heat into useful work.
* The thermal conductivity of a material determines how easily it conducts heat.
* The thermostat in your home maintains a comfortable temperature by regulating the heating or cooling system.
The best word to use with "therm" will depend on the specific topic or concept you are discussing.