recognition has 6 distinct synonyms spread across 4 of its 8 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 state or quality of being recognized or acknowledged
“the partners were delighted with the recognition of their work”
the process of recognizing something or someone by remembering
“a politician whose recall of names was as remarkable as his recognition of faces”
coming to understand something clearly and distinctly
“a growing realization of the risk involved”
(biology) the ability of one molecule to attach to another molecule that has a complementary shape
“molecular recognition drives all of biology, for instance, hormone and receptor or antibody-antigen interactions or the organization of molecules into larger biologically active entities”
the explicit and formal acknowledgement of a government or of the national independence of a country
“territorial disputes were resolved in Guatemala's recognition of Belize in 1991”
an acceptance (as of a claim) as true and valid
“the recognition of the Rio Grande as a boundary between Mexico and the United States”
designation by the chair granting a person the right to speak in a deliberative body
“he was unable to make his motion because he couldn't get recognition by the chairman”
Synonyms, antonyms and the broader and narrower relations for recognition come from Princeton University’s WordNet. Full sources and licences.