8 lists · 4,000 words
Words by length
Every common word of an exact length, from three letters up to ten. Most-used first, with a filter box on each list.
3 letter words 5004 letter words 5005 letter words 5006 letter words 5007 letter words 5008 letter words 5009 letter words 50010 letter words 500
Five letters is the busy one
The 5 letter words list gets the most use by a distance, thanks to Wordle. It splits further, by first letter and by last letter, so you can narrow straight down to the words that fit what you already know.
Shorter lists (three and four letters) suit crosswords and word games. Longer ones are handy for spelling practice. Each list is filtered to real dictionary words and ranked by frequency. The method is written up in full.