subvention vs subvent

subvention is a noun but subvent is not a noun.

Word	Noun	Adjective	Verb	Adverb
subvention	Yes	No	Yes	No
subvent	No	No	Yes	No

As verbs, subvention and subvent are synonyms defined as:

Other synonyms of subvention include underwrite.

subvention (noun)	subvent (noun)
the act or process of providing aid or help of any sort
grant of financial aid as from a government to an educational institution

subvention (verb)	subvent (verb)
guarantee financial support of	guarantee financial support of