Diffuser and Atomizer

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

noun

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

noun

• A dispenser that turns a liquid (such as perfume) into a fine mist.
  • synonyms: atomiser, spray, sprayer, nebulizer, nebuliser

(n.) One who or that which, atomizes; especially, an instrument for reducing a liquid to spray for disinfecting, cooling or perfuming.