As verbs the difference between possess and endow is that possess is to have; to have ownership of while endow is to furnish with money or its equivalent, as a permanent fund for support; to make pecuniary provision for; to settle an income upon; especially, to furnish with dower; as, to endow a wife; to endow a public institution.
See it here:
http://www.wikidiff.com/endow/possess