algorithm - Determine the difficulty of an english word -

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i working word based game. word database contains around 10,000 english words (sorted alphabetically). planning have 5 difficulty levels in game. level 1 shows easiest words , level 5 shows difficult words, relatively speaking.

i need divide 10,000 long words list 5 levels, starting easiest words difficult ones. looking program me.

can tell me if there algorithm or method quantitatively measure difficulty of english word?

i have thoughts revolving around using "word length" , "word frequency" factors, , come formula or accomplishes this.

get large corpus of texts (e.g. gutenberg archives), straight frequency analysis, , eyeball results. if don't satisfying, weight each text flesch-kincaid score , run analysis again - words show frequently, in "difficult" texts score boost, want.

if have 10000 words, though, quicker frequency sorting first pass , tweak results hand.


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