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beam has 17 distinct synonyms spread across 8 of its 13 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 signal transmitted along a narrow path; guides airplane pilots in darkness or bad weather
long thick piece of wood or metal or concrete, etc., used in construction
a group of nearly parallel lines of electromagnetic radiation
a column of light (as from a beacon)
the broad side of a ship
“they sighted land on the port beam”
smile radiantly; express joy through one's facial expression
Synonyms, antonyms and the broader and narrower relations for beam come from Princeton University’s WordNet. Full sources and licences.
express with a beaming face or smile
“he beamed his approval”
broadcast over the airwaves, as in radio or television
“We cannot air this X-rated song”