課題【かだい】
subject, theme, issue, matter, homework, assignment, task, challenge, problem, question
課長【かちょう】
section manager, section chief
課税【かぜい】
taxation
課【か】
lesson, section (in an organization), division, department, counter for lessons and chapters (of a book)
課程【かてい】
course, curriculum
日課【にっか】
daily routine, daily work, daily lesson
賦課【ふか】
levy, imposition