This page is the map to every list on the site. Each one has a distinct purpose, so you can pick the one that fits the question you have, rather than scanning a huge dictionary. All of them search the same 172,830 word dictionary, so their counts and answers agree with each other and with the tools.
By length
Length lists are the foundation of word games, because the board and the rack both limit how long a word can be. Start short: the 2 letter words (103) are the most valuable vocabulary in Scrabble because they let you play in tight spaces. Then the 3 letter words (972) and 4 letter words (3,903) give you the hooks and extensions that turn small plays into scoring ones. The 5 letter words (8,636) are the Wordle length. The 6 letter words (15,232), 7 letter words (23,109) and 8 letter words (28,420) are where bingos live.
By tricky letter
The high-value tiles are the hardest to place, and each has its own list. Words with Q (2,528) includes every Q word without a U. Words with Z (7,029), words with X (4,594) and words with J (2,463) rank the best plays by length. Each page lists the short words in full, because short words are the ones that fit.
By word shape
Endings and beginnings are how you build words from a rack. The words ending in hub counts the endings players use most, and the words ending in ING page covers the biggest one in depth. The words starting with hub does the same for prefixes such as UN, RE and DIS.
Unusual groups
Some lists exist because they are rare, and rare means useful in a pinch. Words without vowels (121) rescues a rack of consonants. Words with all five vowels (2,462) is the reverse. Palindrome words (103) read the same backward.
Tools that use these lists
If you have letters in hand rather than a category in mind, use a tool: the Word Unscrambler, the Anagram Solver, the Scrabble Word Finder or the Words in Words Finder. For a pattern with gaps, use the Crossword Solver, and for a filter by start or end, the Word Finder.