Endearing words in French:
General endearment:
* Mon amour: My love (used for both romantic and familial love)
* Mon chéri(e): My darling/sweetheart
* Mon cœur: My heart
* Ma chérie: My dear (female)
* Mon trésor: My treasure
* Mon petit chou: My little cabbage (affectionate and playful)
* Ma puce: My flea (affectionate and playful)
* Mon ange: My angel
* Mon soleil: My sunshine
* Ma vie: My life
* Mon tout: My everything
* Tu es magnifique/superbe/adorable: You are magnificent/superb/adorable
* Je t'aime beaucoup: I love you a lot
* Tu me manques: I miss you
For children:
* Mon bébé: My baby
* Mon choupinou: My little darling
* Mon petit loup: My little wolf
* Mon petit chat: My little cat
* Mon petit cœur: My little heart
Informal/playful:
* Bisous: Kisses
* Câlins: Cuddles
* Poussin: Chick (used for someone small and cute)
* Lapinou: Bunny (used for someone small and cute)
* Mon petit bonhomme: My little man (used for a boy)
* Ma petite fille: My little girl (used for a girl)
More formal:
* Ma chère/mon cher: My dear (formal)
* Cher/chère: Dear
* Très cher/chère: Very dear
Bonus:
* Mon petit lapin: My little rabbit (used for a partner, often playfully)
* Mon petit chat: My little cat (used for a partner, often playfully)
* Ma douce: My sweetheart (used for a female partner)
Remember, the best way to use endearing words is to be genuine and sincere. The words themselves are just a small part of expressing affection.