bubble vs froth

bubble and froth both are nouns.

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

As nouns, froth is a hyponym of bubble; that is, froth is a word with a more specific, narrower meaning than bubble:

Other hyponyms of bubble include air bubble, foam, soap bubble.

As verbs, froth is a hyponym of bubble; that is, froth is a word with a more specific, narrower meaning than bubble:

Other hyponyms of bubble include effervesce, fizz, foam, form bubbles, sparkle.

bubble (noun)	froth (noun)
a dome-shaped covering made of transparent glass or plastic	a mass of small bubbles formed in or on a liquid
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)	froth (verb)
expel gas from the stomach	exude or expel foam
form, produce, or emit bubbles	become bubbly or frothy or foaming
cause to form bubbles	make froth or foam and become bubbly
rise in bubbles or as if in bubbles
flow in an irregular current with a bubbling noise