Something is galvanized if it is covered in a thin coating of zinc. Steel is galvanized to stop it from rusting. Not to be confused with corrugated.
Gloss describes something that is shiny. Some kinds of paint are glossy. Your hair will be glossy if you look after it well.
Something is described as gnarled if it looks old, knotty and misshapen. Slow-growing trees in very exposed areas often get gnarled. Bonsai trees are deliberately made to look gnarled so they seem older than they are.
Gourmet describes exceptionally good food that requires a lot of skill and preparation to make. Fancy restuarants serve gourmet food.
Grace is an English name for girls. Grace means "gracious." The woman in the picture is Grace Kelly.