Easily excited / (physics) Able to be promoted to an excited state

A person who excites. / The electronic oscillator that generates the carrier signal for a transmitter.

plural of exciter

plural of excitement

In an excitable manner.

(uncountable) The state of being excitable / (countable) A measure of how easy something is to excite

plural of excitant

exciting; stimulating

Something that excites or stimulates; a stimulant

The quality of being excitable, excitability.