| ba | babaille |
| babine | Babylone! |
| 2 bacchantes | background |
| baderne | badigoinces |
| bafouer | bagatelle |
| bagot | bah |
| bail, baux | baïonnette |
| bakélite | balafre |
| 2 balancelle | baleine |
| baliverne | 3 balle |
| ballotte | balsamite |
| bambou | banane |
| bandana | bandit |
| bank-note | banqueroute |
| baobab | baragouin |
| barbadine | barbecue |
| barcarole | 1 barder |
| barge | barka! |
| 2 baron | barre |
| baryte | base-ball |
| bâsir | basquine |
| bastingue | bataclan |
| 2 bateau | bâton |
| baudet | bauxite |
| bayer | B. C. G. |
| beaujolais | bécane |
| béchamel | bedaine |
| bégonia | beigne |
| belliqueux, euse | bémol |
| bénéfique | bénir |
| béotien, enne | béret |
| berlaud, berlot | 1 bernache |
| 2 bernique | besef |
| 1 bêta | beur |
| bhojpuri | biberon |
| bibliographie | bicher |
| bicyclette | bief |
| biffer | bigarade |
| 1 bigot, ote | bilan |
| billard | bimbo |
| binocle | bipède |
| bisbille | 2 bise |
| bisness | bissextil, ile |
| bite | bizarre |
| blafard, arde | blandice |
| -blaste, blasto-, | bled |
| blesser | blinquer |
| blog | 1 blouse |
| blush | 2 bobèche |
| bocage | bodhisattva |
| 2 bogue | boisseau |
| bolchevik | bombarde |
| bonbonne | bonheur |
| bonnir | boom |
| borax | borée |
| boson | bot, bote |
| boubou | bouchon |
| boudiou | bouffir |
| bougnat | bouif |
| bouillir | bouleau |
| boulin | 2 boum |
| 2 bouquin | 1 bourde |
| bourguignon, onne | bourreau |
| bousculer | bout |
| bouton | bovin, ine |
| boy | brachial, ale, aux |
| brahmane, brâhmane | braise |
| brandade | brandy |
| braquet | 1 brasser |
| bravoure | brèdes |
| bréhaigne | brelot, ote |
| bric-à-brac | bride |
| brigand, ande | brimbelle |
| 1 bringue | brisque |
| 2 brocard | brol |
| bronze | brouillamini |
| 1 brousse | bruant |
| brûler | brut, brute |
| buccal, ale, aux | buée |
| bugne | 1 bulle |
| buquer | burgrave |
| burnous | bush |
| butée, butoir | bye bye |
| byzantin, ine |