Open English Wordnet
Nouns
(n)bubblea hollow globule of gas (e.g., air or carbon dioxide) (n)house of cards, bubblea speculative scheme that depends on unstable factors that the planner cannot control“his proposal was nothing but a house of cards”,
“a real estate bubble” (n)bubblean impracticable and illusory idea“he didn't want to burst the newcomer's bubble” (n)bubblea dome-shaped covering made of transparent glass or plastic Verbs
(v)bubbleform, produce, or emit bubbles“The soup was bubbling” (v)bubblerise in bubbles or as if in bubbles“bubble to the surface” (v)bubblecause to form bubbles“bubble gas through a liquid”