governess n 1: a woman entrusted with the care and supervision of a child (especially in a private home)
Governess \Gov"ern*ess\, n. [Cf. OF. governeresse. See {Governor}.] A female governor; a woman invested with authority to control and direct; especially, one intrusted with the care and instruction of children, -- usually in their homes. [1913 Webster]
22 Moby Thesaurus words for "governess": abbess, chaperon, chatelaine, dame, dowager, duenna, educatress, first lady, goodwife, great lady, homemaker, housewife, instructress, madam, matriarch, matron, mistress, mother superior, schooldame, schoolmarm, schoolmistress, tutoress