We don't have any synonyms for had yet.
Think had belongs in the thesaurus? Recommend it and we'll take a look.
Definition of had:
(v) :
(auxiliary, followed by a past participle) Used to form the past perfect tense, expressing an action that took place prior to a reference point that is itself in the past.
(v) :
(auxiliary, now rare) As past subjunctive: would have.