Pronunciation Problems

hace 7 años

According to the social platform Reddit, the following ten words are the most difficult in the English language for non-native (and sometimes even native) speakers to pronounce. 

Worcestershire 
choir 
squirrel 
anemone 
isthmus 
sixth 
penguin 
colonel 
otorhinolaryngologist 
rural

A few of the words aren't very common. I have never said numbers 4, 5 or 9. 

Are any of the words from the list problematic for you? Are there any other words not on the list that you struggle to say? 