O / observātor
noun

observātor

gen. observātōris · gender masculine · decl. 3rd
a watcher, observer; one who obeys it
a watcher, observer (perh. not ante-Aug.): nemo observator, nemo castigator assistet, Plin. Pan. 40: observator et custos bonorum, Sen. Ep. 41, 2: Catholicae legis, i. e. one who obeys it, Cod. Th. 16, 5, 1.