Nouns

(n)soapsuds, suds, latherthe froth produced by soaps or detergents
(n)sudsa dysphemism for beer (especially for lager that effervesces)

Verbs

(v)sudswash in suds
(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)