We don't have synonyms for great bear yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are great deal, great seal and great year.
(n) :
(astronomy) A bright circumpolar asterism of the northern sky, said to resemble a large bear. It is part of the constellation Ursa Major and includes the stars Mizar, Dubhe, and Alkaid.
(n) :
(astronomy) A bright circumpolar asterism of the northern sky, said to resemble a large bear. It is part of the constellation Ursa Major and includes the stars Mizar, Dubhe, and Alkaid.