Here are 29 difficult English words and phrase with more than one possible definition. They are very common, so you have to study them as an English learner! Check out the list, complete with examples and explanations, and get tips for mastering advanced English words . Learn the meaning and pronunciation of 1000+ English words that are hard to spell or understand. Improve your vocabulary with these difficult words and impress your friends and colleagues. Learn over 50 of the most challenging words to spell in the English language, from floccinaucinihilipilification to yttrium. Find out their meanings, origins, and tips to remember them.