Something is valuable if it is worth a lot of money. Some things are valuable for other reasons, for example they have sentimental value because they remind you of someone.
A vegetable is any edible part of a plant that is not very sweet. Some things that are called vegetables are really fruit, like the tomato. Vegetables may be the fruit, leaves (cabbage), stems (asparagus, celery or rhubarb) or roots (carrot, turnip) of a plant.
Something is wobbly if it can move around in an uneven way. Some things that wobble are jello, people learning to ride a bike and wobbly toys like in the picture.