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blood brother has 1 distinct synonym spread across 1 of its 2 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.
a male with the same parents as someone else
“my brother still lives with our parents”
a male sworn (usually by a ceremony involving the mingling of blood) to treat another as his brother
Synonyms, antonyms and the broader and narrower relations for blood brother come from Princeton University’s WordNet. Full sources and licences.