The titles Madame and Mademoiselle are both used to address women in French, but they have different meanings and usage. Madame is used to address a woman who is married or a woman over the age of 18, while Mademoiselle is used to address a young woman who is not married or a single woman of any age.

5 – Married = Madame / Not Married = Mademoiselle The basic rule is simple. If the woman is married, you should say “madame” (even if she is a widow: once married, always “madame”.) If she isn't, you should say “mademoiselle”.

Maison also has French origins, as maison is used as the word for "house." You can use this meaning as a way to remind baby that they'll always have a home with you.

And if you want to know why it is a female noun even though it doesn't end in -e, then the answer is: just because that's how it is. No special reason. Bonjour. The noun is la maison therefore une maison.