galaxy, galactose, galactosidase, galactophorous, galactorrhea, galactic, galactemia

gigabyte, gigaton, gigantic, giant

gloss, glottology, glottography, glottal, glottis, glottic

glucagon, glucose, glucocorticoid, glycolysis, glycogen, glycoprotein

prognathous, gnathion, gnathic, gnathobase

gonorrhea, gonococcal, gonosome

grandad, grandame, grandchild, granddaughter, grandfather, grandma, grandmother, grandpa, grandparent, grandsire

great-aunt, great-grandfather, great-grandmother, great-uncle

greco-roman

gym, gymnosperm

gynoecium, gynocentric, gynopathy

gyromancy, gyrostat, gyroscope