Answer
Some words that are difficult to define are describe, visualization, solid, perpendicular.
I know that you probably know what all these words mean , mean it can be hard to define them without looking them up, therefore they are hard to define.
Answer
The most well known, difficult to define is the word up. It's used as an adverb, adjective, preposition, noun, verb, prefix and suffix. Dictionary.com lists 81 definitions, The Free Dictionary lists 65 definitions, and they each have a long list of idioms using up.
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Dolch's basic sight word list is comprised of 220 English words. These words have been deemed recognizable by sight rather than requiring true reading skills.
Superfluous!
English words beginning with dw:DWARFDWARFISHDWEEBDWARFISMDWELLDWEEBIERDWELTDWEEBISHDWINEDWELLERSDWARFSDWELLINGDWEEBSDWINDLEDDWEEBYDWINDLESDWELLSDWARFISMSDWINEDDWARFLIKEDWINESDWARFNESSDWARFEDDWEEBIESTDWARFERDWELLINGSDWARVESDWINDLINGDWELLEDDWARFISHLYDWELLERDWARFNESSESDWINDLEDWARFISHNESSDWININGDWARFISHNESSESDWARFESTDWARFING
There are no English words that end with the letters EJ.
There are at least 8,801 five-letter words in the English language.