20 Examples of Plural Forms of Nouns:
1. Cat - Cats
2. Dog - Dogs
3. Book - Books
4. Child - Children
5. Woman - Women
6. Man - Men
7. Mouse - Mice
8. Tooth - Teeth
9. Goose - Geese
10. Box - Boxes
11. Bus - Buses
12. Fly - Flies
13. Potato - Potatoes
14. Tomato - Tomatoes
15. Cactus - Cacti
16. Piano - Pianos
17. Hero - Heroes
18. Ox - Oxen
19. Octopus - Octopi/Octopuses
20. Datum - Data