Is "pronunciate" a word?
Solution 1:
As there is the verb to pronounce from French prononcer and Latin pronuntiare, there is no need to coin a second verb from pronunciation.
To pronounce has been in use for over 500 years, so a second and longer verb is unnecessary.
Solution 2:
Based on your research, it looks like many common dictionaries don’t contain that word.
You’re better off using pronounce instead of pronunciate.