What is the hardest word to spell in world for an 8 year old?

It's impossible to say definitively what the "hardest" word to spell is for an 8-year-old, as it depends on individual learning and exposure. Some words that are often considered difficult include:

* "Rhythm": This word has a tricky pronunciation and spelling, with the "th" sound being a common stumbling block.

* "Supercalifragilisticexpialidocious": This made-up word from Mary Poppins is ridiculously long and contains many unusual letter combinations.

* "Queue": The silent "ue" at the end is confusing for many young learners.

* "February": The silent "b" and the "u" sound in the middle can trip up kids.

* "Mischievous": The "ie" and "ous" endings are often difficult to remember.

* "Wednesday": The double "d" and the "es" ending are often misspelled.

Ultimately, the best way to determine which words are hard for a specific 8-year-old is to observe their spelling skills and see which words they struggle with the most.