plasticiser vs plasticizer

plasticiser and plasticizer both are nouns.

Word	Noun	Adjective	Verb	Adverb
plasticiser	Yes	No	No	No
plasticizer	Yes	No	No	No

As nouns, plasticiser and plasticizer are synonyms defined as:

plasticiser and plasticizer: a substance added to plastics or other materials to make them more pliable

plasticiser (noun)	plasticizer (noun)
a substance added to plastics or other materials to make them more pliable	a substance added to plastics or other materials to make them more pliable