schoolmistress vs schoolmarm

schoolmistress and schoolmarm both are nouns.

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

As nouns, schoolmistress and schoolmarm are synonyms defined as:

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

Other synonyms of schoolmistress include mistress, schoolma'am.

schoolmistress (noun)	schoolmarm (noun)
a woman schoolteacher (especially one regarded as strict)	a woman schoolteacher (especially one regarded as strict)