left has 10 distinct synonyms spread across 5 of its 10 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its 2 recorded opposites are right, center.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
location near or direction toward the left side; i.e. the side to the north when a person or object faces east
“she stood on the left”
the piece of ground in the outfield on the catcher's left
“the batter flied out to left”
a turn toward the side of the body that is on the north when the person is facing east
“take a left at the corner”
being or located on or directed toward the side of the body to the west when facing north
“my left hand”
toward or on the left; also used figuratively
“he looked right and left”
Synonyms, antonyms and the broader and narrower relations for left come from Princeton University’s WordNet. Full sources and licences.