国籍【こくせき】
nationality, citizenship, nationality (ship, airplane, etc.), registration, flag
書籍【しょせき】
book, publication
戸籍【こせき】
family register, census
在籍【ざいせき】
being enrolled (at a school), being registered, being a member (of a team, organization, etc.)
除籍【じょせき】
removing a name, expelling (e.g. from school), decommissioning