Time
noun
じかん
時 (とき) Time, Hour
時代 (じだい) Period, Epoch, Era, Time Period
時間 (じかん) Time
時期 (じき) Time, Season, Period
期間 (きかん) Period, Term, Interval
期限 (きげん) Deadline, Term, Due Date
時限 (じげん) Time Limit, Period
歳月 (さいげつ) Time, Years
時間 can be used to talk about Time as in 時間がありますか? 時間 can also be used to talk about an interval of Hours. For example, 六時間 would be a 6 Hour interval.