Some of the words that begin with the prefix circ are circle circus circuit circlet circuitry
Microwave, microscope, microscopic,
Here are some words that have the root word cycl-:CycleCycloneUnicycleRecycle
Some words that have the prefix THERMO are:thermoelectricthermographicthermometerthermonuclearthermosthermostat
What are some words that begin with the prefix pre
Some words are:OfficeOfficiencyOffensiveOffenseOf
"Diagonal" begins with the prefix dia.
The prefix quad means four. Some words with this prefix are quadruple, quadrangle, quadruplets, etc.