bubble vs bubble over

bubble is a noun but bubble over is not a noun.

Word	Noun	Adjective	Verb	Adverb
bubble	Yes	No	Yes	No
bubble over	No	No	Yes	No

bubble (noun)	bubble over (noun)
a dome-shaped covering made of transparent glass or plastic
an impracticable and illusory idea
a speculative scheme that depends on unstable factors that the planner cannot control
a hollow globule of gas (e.g., air or carbon dioxide)

bubble (verb)	bubble over (verb)
expel gas from the stomach	overflow with a certain feeling
form, produce, or emit bubbles
cause to form bubbles
rise in bubbles or as if in bubbles
flow in an irregular current with a bubbling noise