bubble vs fizz

bubble and fizz both are nouns.

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

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

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

bubble (noun)	fizz (noun)
a dome-shaped covering made of transparent glass or plastic	an effervescent beverage (usually alcoholic)
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)	fizz (verb)
expel gas from the stomach	become bubbly or frothy or foaming
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