The Collaborative International Dictionary of English v.0.48:

Frey \Frey\, Freyr \Freyr\(fr[imac]), prop. n. (Norse Mythology)
   The god of earth's fertility and peace and prosperity,
   presiding over rain, sunshine, and all the fruits of the
   earth, dispensing wealth among men; son of Njorth (Njord) and
   brother of Freya; originally of the Vanir; later with the
   Aesir. He was especially worshipped in the temple at Upsala
   in Sweden
   [WordNet 1.5 + Century Dict. 1906]

WordNet (r) 3.0 (2006):

Frey
    n 1: (Norse mythology) god of earth's fertility and peace and
         prosperity; son of Njorth and brother of Freya; originally
         of the Vanir; later with the Aesir [syn: Frey, Freyr]

Moby Thesaurus II by Grady Ward, 1.0:

68 Moby Thesaurus words for "Frey":
   Aesir, Ashtoreth, Astarte, Baal, Balder, Bor, Bori, Bragi, Ceres,
   Cora, Demeter, Dionysos, Dionysus, Donar, Flora, Forseti, Freya,
   Freyja, Freyr, Frigg, Frigga, Gaea, Gaia, Heimdall, Hel, Hertha,
   Hoenir, Idun, Ing, Isis, Ithunn, Kore, Loki, Nanna, Nerthus, Njord,
   Njorth, Odin, Pan, Persephassa, Persephone, Pomona, Priapus,
   Proserpina, Proserpine, Reimthursen, Sif, Sigyn, Thor, Tiu,
   Triptolemos, Triptolemus, Tyr, Ull, Ullr, Vali, Vanir, Vidar,
   Vitharr, Wayland, Weland, Woden, Wotan, Wyrd, corn god,
   fertility god, forest god, vegetation spirit