bubble

nouns

a hollow globule of gas (e.g., air or carbon dioxide)
is derived from
is a type of (narrower)
a small globe or ball
a 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"
an impracticable and illusory idea
"he didn't want to burst the newcomer's bubble"
is a type of (narrower)
something many people believe that is false
"they have the illusion that I am very wealthy"
a dome-shaped covering made of transparent glass or plastic
is a type of (narrower)
an artifact that covers something else (usually to protect or shelter or conceal it)

verbs

form, produce, or emit bubbles
"The soup was bubbling"
see also
is a type of (narrower)
expel (gases or odors)
flow in an irregular current with a bubbling noise
"babbling brooks"
is derived from
rise in bubbles or as if in bubbles
"bubble to the surface"
is a type of (narrower)
move upward
"The fog lifted"; "The smoke arose from the forest fire"; "The mist uprose from the meadows"
cause to form bubbles
"bubble gas through a liquid"
is a type of (narrower)
cause to change; make different; cause a transformation
"The advent of the automobile may have altered the growth pattern of the city"; "The discussion has changed my thinking about the issue"
causes
form, produce, or emit bubbles
"The soup was bubbling"
expel gas from the stomach
"In China it is polite to burp at the table"