What is another word for "halloo"?

Roget's Thesaurus (1911) lists these synonyms for "halloo": accost, address, allocution, alloquy, apostrophe, apostrophize, appeal, aside, audience, ball, button, call, dialogism, dialogue, ear, hey, hist, interpellation, interview, invocation, invoke, lecture, make, plank, platform, private, salutation, salute, soho, speak, speech, take, talk, the, word.