airbrush vs nebuliser

airbrush and nebuliser both are nouns.

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

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

airbrush: an atomizer to spray paint by means of compressed air
nebuliser: a dispenser that turns a liquid (such as perfume) into a fine mist

Other hypernyms of airbrush include atomiser, atomizer, nebulizer, spray, sprayer.

airbrush (noun)	nebuliser (noun)
an atomizer to spray paint by means of compressed air	a dispenser that turns a liquid (such as perfume) into a fine mist

airbrush (verb)	nebuliser (verb)
paint with an airbrush