Definitions:
a thin sphere of liquid enclosing air or another gas

used to refer to a good or fortunate situation that is isolated from reality or unlikely to last

a transparent domed cover or enclosure

(in a cartoon or illustration) a shape resembling a cloud, balloon, or bubble, which contains text representing a character's thoughts or speech

a marine mollusc that typically has a thin scroll-like shell.

(of a liquid) form rising bubbles of gas or air