Nouns

(n)foam, frotha mass of small bubbles formed in or on a liquid“the beer had a thick head of foam”
(n)foama lightweight material in cellular form; made by introducing gas bubbles during manufacture

Verbs

(v)foam, froth, fizz, effervesce, sparkle, form bubblesbecome bubbly or frothy or foaming“The boiling soup was frothing”, “The river was foaming”, “sparkling water”