subvention vs subsidy

subvention and subsidy both are nouns.

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

As nouns, subsidy is a hypernym of subvention; that is, subsidy is a word with a broader meaning than subvention:

subvention: grant of financial aid as from a government to an educational institution
subsidy: a grant paid by a government to an enterprise that benefits the public

subvention (noun)	subsidy (noun)
the act or process of providing aid or help of any sort	a grant paid by a government to an enterprise that benefits the public
grant of financial aid as from a government to an educational institution

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