froth vs bubble

froth and bubble both are nouns.

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

As nouns, bubble is a hypernym of froth; that is, bubble is a word with a broader meaning than froth:

As verbs, bubble is a hypernym of froth; that is, bubble is a word with a broader meaning than froth:

froth (noun)	bubble (noun)
a mass of small bubbles formed in or on a liquid	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)

froth (verb)	bubble (verb)
exude or expel foam	expel gas from the stomach
become bubbly or frothy or foaming	form, produce, or emit bubbles
make froth or foam and become bubbly	cause to form bubbles
	rise in bubbles or as if in bubbles
	flow in an irregular current with a bubbling noise