WordNet records no synonym and no antonym for platoon. It is the only member of each of its synsets, 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 military unit that is a subdivision of a company; usually has a headquarters and two or more squads; usually commanded by a lieutenant
a team of policemen working under the military platoon system
a group of persons who are engaged in a common activity
Synonyms, antonyms and the broader and narrower relations for platoon come from Princeton University’s WordNet. Full sources and licences.
“platoons of tourists poured out of the busses”