Like other romance languages, nouns in french are either “masculine” or “feminine” and adjectives vary accordingly.

black

noir/noire (nwahr)

white

blanc/blanche (blahng/blahnsh)

gray

gris/grise (gree/greez)

red

rouge (roozh)

blue

bleu/bleue (bluh)

yellow

jaune (zhawn)

green

vert/verte (verre/vehrt)

orange

orange (oh-RAHNZH)

purple

violet/violette (vee-oh-LEH/vee-oh-LET)

brown

brun/brune (bruh/bruhn); marron (MAH-rohn)