留学【りゅうがく】
studying abroad, (temporarily) studying at another school (to learn a specific skill)
留学生【りゅうがくせい】
overseas student, exchange student
抑留【よくりゅう】
internment, detainment, detention
在留【ざいりゅう】
residing (esp. abroad), staying, living
留守【るす】
absence, being away from home, house-sitting, house-sitter, being left unattended to (of one's studies, etc.), neglecting
書留【かきとめ】
registered mail, registered post, registration (of mail), (putting on) record, writing down, noting down, registry
保留【ほりゅう】
reservation, putting on hold, deferment, withholding
留守番【るすばん】
care-taking, house-sitting, house-watching, staying at home, caretaker, house-sitter
留年【りゅうねん】
repeating a year (at school), staying in the same class for another year
拘留【こうりゅう】
custody, detention, confinement
停留所【ていりゅうじょ】
stop (bus, tram, etc.), station, stopping place
留める【とどめる】
to stop, to stay (e.g. the night), to cease, to put an end to, to contain, to keep (in position, in place), to limit, to record (e.g. a fact), to retain