What words that end with fe?

There are 13 Words that have this form in plural.

calf, half, knife, life, wife, elf, self, shelf, leaf, sheaf, thief, loaf and wolf.

All Words have the ending "ves" instead of "f" or "fe".

4 Words have two plural endings.

The Words in these cases are able just to add a "s" onto their Word instead of "ves".

dwarf, hoof, scarf og wharf.