The term 'extremely dry' can be described by four different words: XERIC (5 letters), BRUT (4 letters), ARID (4 letters), and SERE (4 letters). XERIC refers to an environment that is very dry, with little rainfall. BRUT is a French word meaning 'very dry'. ARID is a term used to describe a climate or region that receives very little precipitation. Finally, SERE is an adjective meaning 'dry and withered'. All of these words describe the same thing - an environment that is extremely dry.