We don't have synonyms for Vanir yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are venir, vair and vanier.
(n) :
the principal deities, as a group, of the Norse pantheon that represent chaos, fertility, and cultivation; opponents of the AEsir; members of the Swedish royal family whose ancestry is traditionally traced to one of the Vanir deities
(n) :
the principal deities, as a group, of the Norse pantheon that represent chaos, fertility, and cultivation; opponents of the AEsir; members of the Swedish royal family whose ancestry is traditionally traced to one of the Vanir deities