We don't have synonyms for terroirs yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are terror, terrors and terroir.
(n) :
(viticulture) The complete set of local conditions in which a particular wine or family of wines is produced, including soil type, weather conditions, topography, and wine-making savoir-faire.
(n) :
(viticulture) The complete set of local conditions in which a particular wine or family of wines is produced, including soil type, weather conditions, topography, and wine-making savoir-faire.