chewMake sure you chew your food thoroughly.
nibbleShe nibbled on peanuts while waiting for her dinner to cook.
munchHe munched popcorn throughout the whole film.
crunchShe was crunching on an apple.
chompinformalHe was chomping a chocolate bar.
gnawThe dog was gnawing a bone.
masticatespecializedThe patient experienced jaw pain when masticating.