identification has 2 distinct synonyms spread across 2 of its 5 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 act of designating or identifying something
evidence of identity; something that identifies a person or thing
the condition of having the identity (of a person or object) established
“the thief's identification was followed quickly by his arrest”
the process of recognizing something or someone by remembering
“a politician whose recall of names was as remarkable as his recognition of faces”
the attribution to yourself (consciously or unconsciously) of the characteristics of another person (or group of persons)
Synonyms, antonyms and the broader and narrower relations for identification come from Princeton University’s WordNet. Full sources and licences.