3 letters

Nox ∙

4 letters

Knox

5 letters

Lenox Senox ninox

6 letters

magnox ∙ Drinox Lennox

7 letters

equinox ∙ Entonox

8 letters

Trisenox

9 letters

amlexanox

Words with a ∙ are valid Scrabble words (SOWPODS word list)