mistress vs schoolmarm

mistress and schoolmarm both are nouns.

Word	Noun	Adjective	Verb	Adverb
mistress	Yes	No	No	No
schoolmarm	Yes	No	No	No

As nouns, mistress and schoolmarm are synonyms defined as:

mistress and schoolmarm: a woman schoolteacher (especially one regarded as strict)

Other synonyms of mistress include schoolma'am, schoolmistress.

mistress (noun)	schoolmarm (noun)
a woman master who directs the work of others	a woman schoolteacher (especially one regarded as strict)
an adulterous woman; a woman who has an ongoing extramarital sexual relationship with a man
a woman schoolteacher (especially one regarded as strict)