Dictionary.com
Thesaurus.com

morphosyntax

American  
[mawr-foh-sin-taks] / ˌmɔr foʊˈsɪn tæks /

noun

Linguistics.
  1. the study of the morphological and syntactic properties of linguistic or grammatical units.

  2. the rules that determine the relation between one linguistic form and another, defined by morphological and syntactic criteria.