signalman

n (pl -men / -mEn; -mEn/) 1 person who operates signals on a railway （铁路）信号员. 2 person who signals, esp in the army or navy 信号手, 信号兵（尤指陆军或海军的）.

sifter, sigh, sight, sight-read, sight-reading, sight-screen (also screen), sighted, sighting, sightless, sights, sightseeing, sightseer, sign, sign in, sign language, sign on, signal, signal-box, signaller (US signaler), signally, signatory, signature, signature tune (also theme tune), signet, signet ring, significance, significant, significantly, signification, signify, signor, signpost, Sikh, silage, silence, silencer, silent, silent film, silently, silhouette,