Homonyms

Homonyms share the spelling but have a different pronunciation and entirely different meaning:

Bow/bow: You bow to the audience; you string the bow. The first ‘bow’ rhymes with ‘how’ and the second with ‘toe’.

According to Wikipedia:

The word homonym comes from the Greek ὁμώνυμος (homonumos), meaning "having the same name",^] which is the conjunction of ὁμός (homos), meaning "common, same" and ὄνομα (onoma) meaning "name”. Thus, it refers to two or more distinct concepts sharing the "same name" or signifier. Examples of homonyms are the pair stalk (part of a plant) and stalk (follow/harass a person) and the pair left (past tense of leave) and left (opposite of right).

Other examples:

1. Bark (the sound of a dog)bark-(the skin of  a tree)

2. There/their

3. Two/too

4. Desert (to abandon); desert (an arid region)

5. March (rhythmic steady walking); march (name of a month)

6. Fluke( a stroke of luck); fluke(fins on a whale’s tail)