Building a strong vocabulary is essential for preschoolers as it lays the foundation for language development. Here is a list of vocabulary words suitable for preschool-aged children:

1. Apple
2. Ball
3. Cat
4. Dog
5. Elephant
6. Frog
7. Giraffe
8. Hat
9. Ice cream
10. Jellyfish
11. Kite
12. Lion
13. Monkey
14. Nest
15. Orange
16. Penguin
17. Quack (the sound a duck makes)
18. Rainbow
19. Sun
20. Tree
21. Umbrella
22. Van
23. Watermelon
24. Xylophone (for the letter 'X')
25. Yellow
26. Zoo
27. Butterfly
28. Duck
29. Flower
30. Grapes
31. Helicopter
32. Igloo
33. Jacket
34. Kangaroo
35. Lighthouse
36. Mountain
37. Nose
38. Octopus
39. Pizza
40. Queen
41. Rainbow
42. Snail
43. Turtle
44. Unicorn
45. Volcano
46. Wagon
47. X-ray (for the letter 'X')
48. Yo-yo
49. Zipper
50. Acorn

These words cover a range of letters, sounds, and everyday objects, providing a diverse vocabulary for preschoolers to learn and use in their daily interactions.