Mam
Part of speech: noun
Definition: Diminutive of mother.
Madam
Part of speech: noun
Definition: A polite form of address for a woman or lady.The mistress of a household.A conceited or quarrelsome girl.A woman who runs a brothel.
Example sentence: The English, the plain English, of the politest address of a gentleman to a lady is, I am now, dear Madam, your humble servant: Pray be so good as to let me be your Lord and Master.