Initially spurred by finding the names of two couples killed in Saipan during the Pacific War on an Okinawan family tombstone in the Mo‘ili‘ili Japanese Cemetery, I just finished reading a novelized war story about the Saipan campaign, Oba, the Last Samurai, by Don Jones (Jove, 1988), a book passed on to me by an old friend with long Micronesia ties. It contained a few Japanese words of interest.
ババ抜き babanuki (lit. 'granny-draw') 'Old Maid'. As soon as I read that this was a children's card game, I knew it must mean the game called Old Maid in English (and a variety of interesting names in other languages).
神官 shinkan (lit. 'god-manager') is an older term for 'Shinto priest', the person who serves as caretaker of a Shinto shrine and officiates at Shinto rites there. The more common term nowadays seems to be 神主 (native Japanese) kannushi or (Sino-Japanese) jinshu lit. 'god-master', or 神職 shinshoku lit. 'god-employee'. These days, it is very rarely a full-time job.
椰子酒 yashizake (lit. 'coconut/palm-sake') 'palm wine, coconut toddy'. On Saipan, this would almost certainly be coconut toddy, and not some other kind of palm wine, but the author only describes it as derived from a native plant, without mention of coconuts.