Nouns

(n)gel, colloidal gela colloid in a more solid form than a sol
(n)gel, hair geljellylike substance used in hair styling
(n)gelatin, gela thin translucent membrane used over stage lights for color effects

Verbs

(v)gelbecome a gel“The solid, when heated, gelled”
(v)mousse, gelapply a styling gel to“she mousses her hair”