Existem três dialetos que os Wookies podem falar, Shyriiwook, Thykarann e Xaczik. No entanto Chewbacca fala apenas Shyriiwook.
De Artigo de notícias de Star Wars ,
You may think the Wookiee language can’t be too complicated. A howl here, a gruff there. But the reality is there are actually three different languages spoken by the species, all consisting of the same growly howling format. Chewbacca speaks a dialect called Shyriiwook, while other Wookiees may speak either Thykarann or Xaczik. Shyriiwook is the most common to understand, however, as both Han Solo and Rey can decipher Chewie’s grunts.
Agora vamos à sua pergunta,
Does the Wookie language have actual vocabulary and syntax?
Sim. Na verdade, tem. Do mesmo artigo,
Fun fact: Wookiees have 150 words for “wood” but no word for “artist.” They see their amazing carving abilities as a survival skill, not a talent.
Como ele menciona palavras, significa que elas têm vocabulário.
Algumas palavras tiradas de Star Wars: absolutamente tudo o que você precisa saber (Wikia link to the book with o mesmo nome),
How to speak Shyriiwook
"WYAAAAAA!" = "Hello!"
"AARRR WGH GGWAH" = "Jump to hyperspace"
"ROOOARRGH UR ROO" = "I have a bad feeling about this"
"WWWAH RRROOOAAAH WHA?" = "Want to play some holo-chess?"