net has 19 distinct synonyms spread across 9 of its 12 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. Its one recorded opposite is gross.
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 computer network consisting of a worldwide network of computer networks that use the TCP/IP network protocols to facilitate data transmission and exchange
the excess of revenues over outlays in a given period of time (including depreciation and other non-cash expenses)
game equipment consisting of a strip of netting dividing the playing area in tennis or badminton
an open fabric of string or rope or wire woven together at regular intervals
Synonyms, antonyms and the broader and narrower relations for net come from Princeton University’s WordNet. Full sources and licences.