prove vs leaven

prove is not a noun while leaven is a noun.

Word	Noun	Adjective	Verb	Adverb
prove	No	No	Yes	No
leaven	Yes	No	Yes	No

As verbs, prove and leaven are synonyms defined as:

Other synonyms of prove include raise.

prove (noun)	leaven (noun)
	an influence that works subtly to lighten or modify something
	a substance used to produce fermentation in dough or a liquid

prove (verb)	leaven (verb)
establish the validity of something, as by an example, explanation or experiment	cause to puff up with a leaven
obtain probate of
prove formally; demonstrate by a mathematical, formal proof
provide evidence for
take a trial impression of
cause to puff up with a leaven
increase in volume
put to the test, as for its quality, or give experimental use to
be shown or be found to be