pb has 7 distinct synonyms spread across 4 of its 4 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 soft heavy toxic malleable metallic element; bluish white when freshly cut but tarnishes readily to dull grey
“the children were playing with lead soldiers”
a unit of information equal to 1000 terabits or 10^15 bits
Synonyms, antonyms and the broader and narrower relations for pb come from Princeton University’s WordNet. Full sources and licences.
a unit of information equal to 1000 terabytes or 10^15 bytes
a unit of information equal to 1024 tebibytes or 2^50 bytes