Nouns

(n)foam, frotha mass of small bubbles formed in or on a liquid“the beer had a thick head of foam”

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”
(v)froth, spume, sudsmake froth or foam and become bubbly“Great cliffs loomed above them, and little streams spumed and dashed in rocky gorges below” (H. Beam Piper)
(v)frothexude or expel foam“the angry man was frothing at the mouth”