We don't have synonyms for donatives yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are donative, conative and donations.
(n) :
(ecclesiastical law) A benefice conferred on a person by the founder or patron, without either presentation or institution by the ordinary, or induction by his orders.
(n) :
(ecclesiastical law) A benefice conferred on a person by the founder or patron, without either presentation or institution by the ordinary, or induction by his orders.