Without any modifiers, the French word anniversaire means "birthday" -- although it can refer to an anniversary of any kind.
However, the term "bonne fête" (literally happy party) is used to express "Happy Birthday."
a birthday is 'un anniversaire' in French
Birthday is "anniversaire" (masc.) in French.
d'anniversaire
A birthday cake in French is 'un gâteau d'anniversaire'
"Bonaniversè" is how you would say Happy Birthday in Louisiana Creole French.
you say mon gorna be mansa
un anniversaire
"Today is my birthday!" in French is "Aujourd'hui est mon anniversaire !"
you say "son anniversaire"
C'est mon anniversaire.
joyeux anniversaire
Joyeux anniversaire