lather vs effervesce

lather is a noun but effervesce is not a noun.

Word	Noun	Adjective	Verb	Adverb
lather	Yes	No	Yes	No
effervesce	No	No	Yes	No

As verbs, effervesce is a hypernym of lather; that is, effervesce is a word with a broader meaning than lather:

Other hypernyms of lather include fizz, foam, form bubbles, froth, sparkle.

lather (noun)	effervesce (noun)
the froth produced by soaps or detergents
the foam resulting from excessive sweating (as on a horse)
a workman who puts up laths
agitation resulting from active worry

lather (verb)	effervesce (verb)
rub soap all over, usually with the purpose of cleaning	become bubbly or frothy or foaming
exude sweat or lather
form a lather
beat severely with a whip or rod