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calf-calves dwarf-dwarfs or dwarves elf-elves half-halves hoof-hoofs or hooves knife-knives leaf-leaves life-lives loaf-loaves scarf-scarfs or scarves self-selves sheaf-sheaves shelf-shelves staff-staffs or staves (sticks or musical ones) thief-thieves wharf-wharfs or wharves wife-wives wolf-wolves | chiefs cliffs cuffs diffs gulfs huffs muffs oafs puffs reefs roofs safes surfs tiffs toffs |