nebuliser vs dispenser

nebuliser and dispenser both are nouns.

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

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

nebuliser: 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

nebuliser (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 person who dispenses