I think the words that come to American English from French
are some of the hardest words to pronounce. For example this word. It's pronounced
entrepreneur. Nr, all r, no vowel. You can also pronounce it nur. En-tre-​pre-​neur.
But look at this tr, We pronounce it like a chr.
En-chre, chre, en-chre-​pre, neur!
Entrepreneur.