It differs in the use of -nzi to form the plural of nouns, pronouns and adjectives rather than -es as it Hittite. The dependence of one noun on another is not indicated by a genitive case but by a suffix « sas » added to the dependent noun meaning « his or its ».
This explains many place names in the Aegean region ending in « assos » from the Greek period, eg Knossos, Tylisos etc. In the Hittite texts passages in Luwian are introduced by the adverb « luwili ». The language also differs from Hittite in its inherited (non Indo-European ?) sub strata.