5 letters

vanir

6 letters

Hoenir Avenir ∙ fafnir

7 letters

Revenir Gungnir glitnir

8 letters

souvenir ∙ Hrungnir cefdinir parennir Gleipnir Sleipnir

10 letters

bilskirnir

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