How do you pronounce 'ballet'?
It is commonly mispronounced: it comes from French, so the ‘t’ is silent.
And the stress is different in US and UK English.
American English tends to keep the French pronunciation of these words, with the stress on the second syllable e.g.
[US] ballET - bæˈleɪ chaLET - ʃæˈleɪ
[UK] BALLet - ˈbæleɪ CHAlet - ˈʃæleɪ
Not all words follow this rule though! Here's the complete list of words ending in 'et'.
Notice the WEAK ending of the other (sounded) 'et' words. Compare:
English learners tend to make all 'et' sounds FULL e.g. 'market'