bubbles
bub-bles
noun
Small spheres of gas trapped within a liquid or solid material.
"The champagne had tiny bubbles."
verb
To form or produce small spheres of gas, often rising to the surface.
"The water bubbles in the kettle."
Thesaurus
Synonyms: bubble, house of cards, eruct, burp, belch, burble, guggle, gurgle, ripple, babble