As stated in response to another question on the same page as this one, titled "What is the translation for the word What in dragon?"

In canon there is none. Give context and we can help rephrase the sentence without "what" in it.
- Ruvgein

Questions are implied with question marks or infection (for speaking) so here are some alternatives to asking "what" directly:

"What do you want?"
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"Fun/Tinvaak laaniil" - "Tell/Speak your request."
"Laaniil" - "Your question?"

"What is the word for greed?"
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"Rot do/fah vokul laan do faraan?" - "Word of/for evil desire of wealth?"

Etc...
-Zinrahzul

In addition, the Legacy word is fos and shares all usages of the English 'what' as well as those of 'which'.