what are English words that are difficult to spell?

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Be sure to read several of these articles; then you should be able to come up with your own list.

Check this out, too:
http://grammar.ccc.commnet.edu/grammar/spelling.htm

There are several English words that are considered difficult to spell due to their irregular spelling patterns or unusual combinations of letters. Here are a few examples:

1. Accommodation: This word often poses difficulties as it contains multiple double consonants and ends with the four-letter sequence "-tion."

2. Colonel: The pronunciation of this word does not align with its spelling. The silent "l" and the different pronunciation of the letters "o" and "e" make it tricky to spell correctly.

3. Guarantee: The double "u" and the unusual arrangement of vowels can make this word challenging to spell accurately.

4. Pneumonia: This word contains silent letters ("p" and the first "n") and a sequence of consonants that can be difficult to remember.

5. Rhythm: The combination of "h" and "y" in this word can make it difficult to spell, as it goes against the usual spelling patterns.

To improve your spelling skills, it's helpful to practice regularly and use techniques such as breaking down words into syllables, memorizing word patterns, and utilizing mnemonic devices. Additionally, consulting a dictionary or using spell-check tools can assist in learning the correct spelling of challenging words.