life has 13 distinct synonyms spread across 6 of its 14 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. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
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.
the experience of being alive; the course of human events and activities
“he could no longer cope with the complexities of life”
the course of existence of an individual; the actions and events that occur in living
“he hoped for a new life in Australia”
the period during which something is functional (as between birth and death)
“the battery had a short life”
the period between birth and the present time
“I have known him all his life”
the period from the present until death
“he appointed himself emperor for life”
a living person
“his heroism saved a life”
animation and energy in action or expression
“it was a heavy play and the actors tried in vain to give life to it”
living things collectively
“the oceans are teeming with life”
the organic phenomenon that distinguishes living organisms from nonliving ones
“there is no life on the moon”
an account of the series of events making up a person's life
a motive for living
“pottery was his life”
a prison term lasting as long as the prisoner lives
“he got life for killing the guard”
Synonyms, antonyms and the broader and narrower relations for life come from Princeton University’s WordNet. Full sources and licences.