sprayer vs dispenser

sprayer and dispenser both are nouns.

Word	Noun	Adjective	Verb	Adverb
sprayer	Yes	No	No	No
dispenser	Yes	No	No	No

As nouns, dispenser is a hypernym of sprayer; that is, dispenser is a word with a broader meaning than sprayer:

sprayer: a dispenser that turns a liquid (such as perfume) into a fine mist
dispenser: a container so designed that the contents can be used in prescribed amounts

sprayer (noun)	dispenser (noun)
a dispenser that turns a liquid (such as perfume) into a fine mist	a container so designed that the contents can be used in prescribed amounts
a worker who applies spray to a surface	a person who dispenses