Abstract Polysynthesis presupposes the existence of ‘words’, a domain or unit of phonology and syntax that is extremely variable within and across languages: what behaves as a ‘word’ with respect to one phonological or syntactic rule or constraint may not behave as such with respect to other rules or constraints. Here we develop a system of variables that allows cataloguing all verb-based domains in a language in a bottom-up fashion and then determining any potential convergence of domains in an empirical way. We apply the system to case studies of Mapudungun and Chintang. These confirm earlier observations that polysynthetic languages do not operate with unified units of type ‘word’ in either phonology or syntax.
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