Meaning : A mass of small bubbles formed in or on a liquid.
Example :
The beer had a thick head of foam.
Synonyms : froth
Meaning : A lightweight material in cellular form. Made by introducing gas bubbles during manufacture.
Meaning : Become bubbly or frothy or foaming.
Example :
The boiling soup was frothing.
The river was foaming.
Sparkling water.
Synonyms : effervesce, fizz, form bubbles, froth, sparkle