A wart is a lump of abnormal skin growth that is caused by a virus. Depending on where they are, they can be painful. Some warts go away by themselves fairly quickly, others need to be removed by applying acid or by freezing them or cutting them off.
Something that looks like it has warts is described as warty. Toads look very warty, and so does the gourd in the picture.
Scientific name: phacochoerus africanus
The warthog is a king of pig that lives in Africa. It has a lumpy face, hence the name warthog. Warthogs have two pairs of tusks which they use to fight and dig for food.
A washboard is a device that used to be used to wash clothes with before washing machines were invented. Washboards have a bumpy surface that you rub wet, soapy clothes onto to get them clean.
A washer is usually put on the threaded side of a bolt to spread the force of the tightened bolt. Washers can also be used for spacing, and even for making jewelry from.
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A washing machine is a device that washes your clothes for you. You usually find one of these in the bathroom or laundry of your house, or at a laundromat.
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Wasps are a group of flying, stinging insects that eat other insects. They usually eat pest insects like caterpillars, and can be very useful to gardeners and farmers who are trying to keep their crops safe. Wasp can sting many times, while bees can only sting once.