Suffuse is a verb meaning to spread or diffuse through or over something, usually in a gradual manner. IMPREGNATE (10 letters) means to FILL or SATURATE something with a quality or influence. SATURATE (8 letters) means to FILL something completely with a substance. DRENCH (6 letters) means to soak something thoroughly with liquid. FILL (4 letters) means to make something full or complete. STEEP (5 letters) means to soak something in a liquid for a period of time. BATHE (5 letters) means to wash or soak something in a liquid. PERVADE (7 letters) means to spread throughout something. IMBUE (5 letters) means to PERMEATE or FILL something with a quality or influence. TINGE (5 letters) means to color or dye something slightly. PERMEATE (8 letters) means to spread throughout something. All of these words describe the action of suffusing something, either with a substance, quality, or influence.