Synonyms for Gourmandize:

n.

gourmandize (noun)
pig out, binge, overgorge, gormandize, satiate, glut, overeat, stuff, scarf out, ingurgitate, gorge, gormandise, englut, overindulge, engorge.

v.

overeat (verb)
gorge, pig out, binge, overindulge.

Other synonyms:

n.
binge, englut, engorge, glut, gorge, gormandise, gormandize, ingurgitate, overeat, overgorge, overindulge, pig out, satiate, scarf out, stuff.
Other relevant words:
overeat.