pound has 30 distinct synonyms spread across 20 of its 22 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.
16 ounces avoirdupois
“he got a hernia when he tried to lift 100 pounds”
the basic unit of money in Great Britain and Northern Ireland; equal to 100 pence
a unit of apothecary weight equal to 12 ounces troy
the basic unit of money in Syria; equal to 100 piasters
the basic unit of money in the Sudan; equal to 100 piasters
the basic unit of money in Lebanon; equal to 100 piasters
formerly the basic unit of money in Ireland; equal to 100 pence
the basic unit of money in Egypt; equal to 100 piasters
the basic unit of money in Cyprus; equal to 100 cents
a nontechnical unit of force equal to the mass of 1 pound with an acceleration of free fall equal to 32 feet/sec/sec
United States writer who lived in Europe; strongly influenced the development of modern literature (1885-1972)
a symbol for a unit of currency (especially for the pound sterling in Great Britain)
Synonyms, antonyms and the broader and narrower relations for pound come from Princeton University’s WordNet. Full sources and licences.
break down and crush by beating, as with a pestle
“pound the roots with a heavy flat stone”