WordNet records no synonym and no antonym for crosshairs. It is the only member of its synset, which is common for technical, taxonomic and single-sense vocabulary — there is no other English word that means the same thing. The broader and narrower terms below are the useful relations in that case.
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 center of interest
“the war on terrorism has put Saddam Hussein in the crosshairs”
Synonyms, antonyms and the broader and narrower relations for crosshairs come from Princeton University’s WordNet. Full sources and licences.