vaporizer vs vaporiser

vaporizer and vaporiser both are nouns.

Word	Noun	Adjective	Verb	Adverb
vaporizer	Yes	No	No	No
vaporiser	Yes	No	No	No

As nouns, vaporizer and vaporiser are synonyms defined as:

vaporizer and vaporiser: a device that puts out a substance in the form of a vapor (especially for medicinal inhalation)

vaporizer (noun)	vaporiser (noun)
a device that puts out a substance in the form of a vapor (especially for medicinal inhalation)	a device that puts out a substance in the form of a vapor (especially for medicinal inhalation)