Neanderthal Words

I am working on a book on human evolution. Humans and Neanderthals
co-existed in Europe from about 46,000 to 24,500 years ago.
Neanderthals had a hyoid bone and are believed to have had a language.
Thus, there is a possibility that some Neanderthal words entered the
Indo-European language. Does anyone know of any words that might be
candidates?