mustard plaster vs sinapism

mustard plaster and sinapism both are nouns.

Word	Noun	Adjective	Verb	Adverb
mustard plaster	Yes	No	No	No
sinapism	Yes	No	No	No

As nouns, mustard plaster and sinapism are synonyms defined as:

mustard plaster and sinapism: a plaster containing powdered black mustard; applied to the skin as a counterirritant or rubefacient

mustard plaster (noun)	sinapism (noun)
a plaster containing powdered black mustard; applied to the skin as a counterirritant or rubefacient	a plaster containing powdered black mustard; applied to the skin as a counterirritant or rubefacient