IPA: /ˈspreɪər/
KK: /ˈsprer/
A device or object that is used to spray liquids, often in a fine mist, such as a spray bottle or a garden sprayer.
She used a sprayer to water the plants in her garden.
Sprayer → It is formed from "spray" (from Middle English *sprayen*, meaning to scatter or sprinkle) and "-er" (meaning a person who). A sprayer is a person or device that scatters or sprays liquid.
Think of someone or something that 'scatters' ('spray') liquid — the '-er' indicates a person or device that does this.