The words bare, bear sound the same but have different meanings and spellings. Why do bare, bear sound the same even though they are completely different words?
The answer is simple: bare, bear are homophones of the English language.
Lacking the usual or appropriate covering or clothing; naked: a bare arm.
Exposed to view; undisguised: bare fangs.
Lacking the usual furnishings, equipment, or decoration: bare walls.
Having no addition, adornment, or qualification: the bare facts. See Synonyms at empty.
To hold up; support.
To carry from one place to another; transport.
To carry in the mind; harbor: bear a grudge.
To transmit at large; relate: bearing glad tidings.
Definitions from The American Heritage® Dictionary of the English Language, 4th Edition and Wordnik.
Homophones (literally "same sound") are usually defined as words that share the same pronunciation, regardless of how they are spelled.