It's great to hear that you're interested in helping kids learn new vocabulary! Here are some suggestions for each of the categories you mentioned:

Days of the week:
Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday

Months of the year:
January, February, March, April, May, June, July, August, September, October, November, December

Vegetables:
Carrots, broccoli, cauliflower, cabbage, spinach, kale, lettuce, peppers, onions, garlic, potatoes, sweet potatoes, squash, zucchini, tomatoes, cucumbers

Animals:
Dog, cat, fish, bird, rabbit, hamster, guinea pig, mouse, rat, lizard, snake, turtle, frog, butterfly, bee, ant, spider, horse, cow, pig, sheep, goat, chicken, duck, goose, turkey

Body parts:
Head, hair, eyes, nose, mouth, ears, neck, shoulders, arms, hands, fingers, chest, stomach, back, hips, legs, knees, feet, toes

Vehicles:
Car, truck, bus, bicycle, motorcycle, boat, ship, airplane, helicopter, train

Community helpers:
Police officer, firefighter, doctor, nurse, teacher, postal worker, garbage collector, farmer, chef, construction worker

Numbers:
One, two, three, four, five, six, seven, eight, nine, ten, eleven, twelve, thirteen, fourteen, fifteen, sixteen, seventeen, eighteen, nineteen, twenty

Alphabets:
A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z

Colors:
Red, blue, yellow, green, orange, purple, pink, black, white, gray, brown

Shapes:
Circle, square, triangle, rectangle, oval, diamond, star, heart

Fruits:
Apple, banana, orange, peach, pear, plum, strawberry, raspberry, blueberry, blackberry, pineapple, watermelon, grapefruit, kiwi, mango

Descriptions:
Big, small, tall, short, fast, slow, hot, cold, wet, dry, hard, soft, heavy, light, sweet, sour, salty, bitter, spicy, delicious, yucky

These are just some examples, but there are many more words that kids can learn in each category. Remember to make learning fun and engaging for kids, and try to incorporate new vocabulary into everyday conversations and activities!