[おとし, otoshi] (n) (1) (abbr) dropping; losing; (2) missing item; something one forgot to write down; (3) trap; (4) wooden protrusion from a Japanese door frame that fits a hole in the threshold, acting as a lock when closed; (5) conclusion (of a speech, etc.); (6) (See 落とし掛け) metallic bowl used to hold the charcoal in a wooden hibachi#5397
[おじゃま, ojama] (n, vs) (pol) (See 邪魔) hindrance; intrusion (suru and itasu verb forms are used as set phrases said prior to entering or leaving someone's home)