3 letters:
* ace
* for
* men
* nor
* one
* son
4 letters:
* acne
* core
* earn
* form
* iron
* mace
* more
* once
* poem
* roam
* sore
5 letters:
* acorn
* amen
* canoe
* crane
* manor
* mourn
* ocean
* prone
* score
* stone
6 letters:
* enforce
* manner
* menace
* romance
7 letters:
* enforce
8 letters:
* performance
9 letters:
* performance
This list might not be exhaustive, and there could be more words depending on your word dictionary or rules. Let me know if you have any other word puzzles you'd like to solve!