The letters in RUNNING make 22 words of two letters or more. The longest is RUNNING at 7 letters, and the highest-scoring is RUNNING at 8 points.
No other single word uses all 7 letters of RUNNING. RUNNING has 7 letters: 2 vowels and 5 consonants, worth 8 points before any board bonuses.
7-letter words 1
5-letter words 3
inurn5ruing6unrig6
4-letter words 5
girn5grin5ring5ruin4rung5
3-letter words 10
gin4gnu4inn3nun3rig4rin3rug4run3uni3urn3
2-letter words 3
in2nu2un2
Words are from our open word list and include some game-only words. Rude words are left out of this page; the unscrambler shows every valid word, lets you add blank tiles and filter by length.