single noun: plural nouns:1. person. people2. dog. dogs3. apple. apple4. tree. trees5. cactus. cacti6. cloud. clouds7. bird. birds8. girl. girls9. woman. women10. man. men11. boy. boys12. cat. cats13. bag. bags14. pencil. pencils15. kite. kites16. flower. flowers17. leaf. leaves18. book. books19. pen. pen20. sock. socks
Shield volcanoes are the least explosive type of volcano because their lava is less viscous and flows more easily.