Singular Plural
| Singular | Plural |
| Knife | knieves |
| Child | children |
| Cow | cows |
| Enemy | enemies |
| Facility | facilities |
| Man | men |
| Thief | thieves |
| Difficulty | difficulties |
| Tree | trees |
| Bench | benches |
| Mango | mangoes |
| Enemy | enemies |
| Monkey | monkeys |
| Week | weeks |
| Mouse | mice |
| Ox | oxen |
Singular Plural
| Singular | Plural |
| Knife | knieves |
| Child | children |
| Cow | cows |
| Enemy | enemies |
| Facility | facilities |
| Man | men |
| Thief | thieves |
| Difficulty | difficulties |
| Tree | trees |
| Bench | benches |
| Mango | mangoes |
| Enemy | enemies |
| Monkey | monkeys |
| Week | weeks |
| Mouse | mice |
| Ox | oxen |