gross has 27 distinct synonyms spread across 7 of its 10 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 net.
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.
visible to the naked eye (especially of rocks and anatomical features)
without qualification; used informally as (often pejorative) intensifiers
“an arrant fool”
the entire amount of income before any deductions are made
1 of the 10 recorded senses carries no synonym, antonym or related term, so it is not shown above. Every sense, with its definition and examples, is on the full entry for gross.
Synonyms, antonyms and the broader and narrower relations for gross come from Princeton University’s WordNet. Full sources and licences.