Synonyms for Foam:

n.

cleaner, air freshener, borax, French Polish, abrasive, bleach, cleanser, dishwashing liquid, disinfectant. cream, bubble bath, bath oil, shower gel, bar, cake, bath salts, yeast, solid, soap. fume, fiber, hank, fibre, block, fog, rage, flare up, feelings, bristle, boil over, knot, blow up, burn, explode, steam, anger, billow. head. bubble (noun)
surf, effervescence.
bubbles (noun)
lather.
bubbles formed from a liquid (noun)
lather, yeast, head, surf, cream, froth, spray, spume, suds.
foam (noun)
froth, fizz, suds, effervesce, seethe, sparkle, spume.
object (noun)
froth.
rubber (noun)
foam rubber, rubber, crepe, latex.

v.

become bubbly (verb)
effervesce, fizz, aerate, seethe, sparkle, boil.
bubble (verb)
effervesce, bubble, balloon, spray, aerate, cloud, boil, lather, froth, fizz.

Other synonyms:

cleaner, dishwashing liquid, French Polish, bath oil, borax, cleanser, bath salts, disinfectant, bleach, air freshener, hank, shower gel. cake, cream, bristle, soap, yeast, bubble bath. anger, abrasive. knot, fiber. fog, explode. rage. burn. block, bar. head. rubber
foam rubber, crepe.
Other relevant words:
explode, bristle, seethe, rubber, cake, head, sparkle, fume, suds, spume, cleanser, knot, soap, block, anger, rage, crepe, blow up, steam, burn, hank, yeast, boil over, cream, foam rubber.

Usage examples for foam

  1. Like the ever- shifting curves which the white foam of the untiring tide describes upon the shore, races may ebb and flow; but they have their boundaries, in either direction, beyond which they can never pass. – On the Variation of Species, with Especial Reference to the Insecta ; Followed by an Inquiry into the Nature of Genera by Thomas Vernon Wollaston
  2. Far down through the trees I can see the sparkle of the waves- beyond, the broad plain of blue; and on the headland, a mile away, white foam is dashing. – The Testing of Diana Mallory by Mrs. Humphry Ward