Floccinaucinihilipilification: The act of considering something as unimportant. Often cited due to its length and plethora of uncommon phonemes.
Antidisestablishmentarianism: Opposition to the disestablishment of state churches. Its length and syllabic density make it a tongue twister.
Sesquipedalian: Relating to long words or a person who uses them. Ironically, its pronunciation can be as tricky as its meaning implies.
Worcestershire: A type of sauce. Despite its seemingly simple structure, its pronunciation often confuses non-locals and foreigners.
Pneumonoultramicroscopicsilicovolcanoconiosis: A lung disease caused by inhaling fine silicate or quartz dust. One of the longest words in major dictionaries
Supercalifragilisticexpialidocious: A made-up word from the film "Mary Poppins". It's intended to express something extraordinary and is itself quite extraordinary to pronounce.
Squirrel: For non-native English speakers, the unique "squ-" beginning combined with the "rl" ending can be quite challenging
Onomatopoeia: A word that imitates the sound it represents, like "buzz" or "hiss". Ironically, its pronunciation doesn’t sound like what it represents.
Rural: Pertaining to the countryside. The juxtaposition of "r" sounds in close proximity can make it tricky for some to pronounce.
Anemone: A type of marine animal or flower. The sequence of "n" and "m" sounds can be difficult to articulate clearly.