Answer: Homophones.
Explanation:
Homophones are words that sound the same, but are spelled different and have a different meaning. (e.g. Sea, see)
Homonyms are words that are spelled the same, but have different meanings. (e.g. Close, close) (One that is not far away, the other that means to close something shut.)
Synonyms are words that have similar/same meanings to others. (e.g Happy, joy)