Abdul is absolutely right, but then again it depends on which country we are talking about.
My answer is in relation to Australia, where an "Assurer" submits an "Assurance of Support" to the government to an "Assuree":

An Assurance of Support is a legally binding agreement between an Australian Resident (the assurer) and the Australian Government. The assurer agrees to provide support to the migrant (the assuree) in Australia. Each Assurance of Support can cover up to two adults and an unlimited number of their dependent children. If the migrant or their dependants claim one of the social security payments listed below while covered by an Assurance of Support agreement, the assurer must repay the full amount back to the Government.

The payment of a bond may also be required.

The Assurance of Support Scheme is administered by Centrelink on behalf of the Department of Family and Community Services

to sponsor others
it could be used both as an adjective and verb

my sponsor كفيلي

كفيل sponsor

*

Sponsorship is the act of sponsoring while the sponsor will be a person or an entity.