minor tranquilliser vs minor tranquilizer

minor tranquilliser and minor tranquilizer both are nouns.

Word	Noun	Adjective	Verb	Adverb
minor tranquilliser	Yes	No	No	No
minor tranquilizer	Yes	No	No	No

As nouns, minor tranquilliser and minor tranquilizer are synonyms defined as:

minor tranquilliser and minor tranquilizer: a tranquilizer used to relieve anxiety and reduce tension and irritability

Other synonyms of minor tranquilliser include antianxiety drug, anxiolytic, anxiolytic drug, minor tranquillizer.

minor tranquilliser (noun)	minor tranquilizer (noun)
a tranquilizer used to relieve anxiety and reduce tension and irritability	a tranquilizer used to relieve anxiety and reduce tension and irritability