Diffuser and Diffused

diffuser

(n.) One who or that which, diffuses.

Webster's Revised Unabridged Dictionary

Baffle that distributes sound waves evenly.
- synonyms: diffusor
Optical device that distributes the light of a lamp evenly.
- synonyms: diffusor

diffused

Move outward.
- usage: "The soldiers fanned out"
- synonyms: diffuse, spread, spread out, fan out
Spread or diffuse through.
- usage: "An atmosphere of distrust has permeated this administration"; "music penetrated the entire building"; "His campaign was riddled with accusations and personal attacks"
- synonyms: permeate, pervade, penetrate, interpenetrate, diffuse, imbue, riddle
Cause to become widely known.
- usage: "spread information"; "circulate a rumor"; "broadcast the news"
- synonyms: circulate, circularize, circularise, distribute, disseminate, propagate, broadcast, spread, diffuse, disperse, pass around

Of light rays. ( subjected to scattering by reflection from a rough surface or transmission through a translucent material)
- usage: "diffused light"
Of light. ( transmitted from a broad light source or reflected).
- synonyms: soft, diffuse

Webster's Revised Unabridged Dictionary