sinapism vs mustard plaster

sinapism and mustard plaster both are nouns.

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

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

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

sinapism (noun)	mustard plaster (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