froth

Noun

• a mass of small bubbles formed in or on a liquid
  • the beer had a thick head of foam
    

Verb

• exude or expel foam
  • the angry man was frothing at the mouth
    

• make froth or foam and become bubbly
  • The river foamed
    

• become bubbly or frothy or foaming
  • The boiling soup was frothing
    
  • The river was foaming
    
  • Sparkling water
    

Related words

• Synonyms: 
  foam , spume , suds , fizz , effervesce , sparkle , form bubbles