Besides their fairly consistent ergative alignment and their generally agglutinative morphology (despite a number of not entirely predictable morpheme mergers), Hurrian and Urartian are also both characterized by the use of suffixes in their derivational and inflectional morphology (including ten to fifteen grammatical cases) and postpositions in syntax; both are considered to have the default order subject–object–verb, although there is significant variation, especially in Urartian.