Synonyms for Mosquito Hawk (same or very similar meaning)
WordNet sense 1 (slender-bodied non-stinging insect having iridescent wings that are outspread at rest; adults and nymphs feed on mosquitoes etc.):
dragonfly, darning needle, sewing needle, devil's darning needle, skeeter hawk, snake doctor, snake feederWordNet sense 2 (mainly nocturnal North American goatsucker):
nighthawk, bullbatFrom the ODE community, based on WordNetadd/edit