Homophones, also known as sound-alike words, are words that are pronounced identically although they have different meanings and often have different spellings as well. These words are a very common source of confusion when writing. Common examples of sets of homophones include: to, too, and two; they're and their; bee and be; sun and son; which and witch; and plain and plane. Homophones are often used to create puns. The last usage is common in poetry and creative literature. We use homophones all the time, even in everyday speech. They are also a common source of humour in jokes, and frequently occur in riddles.
Usually homophones are in groups of two (our, hour), but occasionally they can be in groups of three (to, too, two) or even more. One more example is:
bear (noun: large, heavy animal with thick fur)
bear (verb: tolerate, endure)
bare (adjective: naked, without clothes)