vocabularies

How a sprayer generates and pressurizes its spray: trigger (a squeeze- or finger-pump atomizer with no stored pressure, the household spray bottle), pump-pressure (a manual pre-compression pump that pressurizes a sealed vessel for continuous spray — the hand pressure sprayer and the back-worn knapsack), or hose-end (a reservoir applicator that atomizes using the mains water supply, the garden hose-end/dial-spray). A token category recurring across sprayer kinds (L11); a growing vocabulary (L13) — battery and mains-electric (powered) mechanisms are added when the powered MistSprayer kind is minted (follow-up D13a). Its members are VALUES of a sprayer kind, not separate classes: a trigger bottle, a pump sprayer and a hose-end sprayer are sprayers that differ by this mechanism.

Answers the question: spray mechanism.