WordNet records no synonym and no antonym for bar mitzvah. It is the only member of each of its synsets, which is common for technical, taxonomic and single-sense vocabulary — there is no other English word that means the same thing. The broader and narrower terms below are the useful relations in that case.
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.
(Judaism) an initiation ceremony marking the 13th birthday of a Jewish boy and signifying the beginning of religious responsibility
“a bar mitzvah is an important social event”
confirm in the bar mitzvah ceremony, of boys in the Jewish faith
Synonyms, antonyms and the broader and narrower relations for bar mitzvah come from Princeton University’s WordNet. Full sources and licences.