Here are some word lists that show interesting word patterns. These lists are created in support of various Scrabble clubs in the country. All words are valid in TWL (OWL3) and Collins.

Please feel free to share them with attribution.
unusal E back hook and A front hook
words with JET in them
Change one letter to get a new word
Some weird definitions on COW
Words that can be spelled backwards
Words with front H, K and J front hooks
Common words that take A or O backhooks
words that take front or back S hooks
words that end with LIKE