剧 (jù) as a noun refers to a drama, play, or theatrical work. It is commonly used as a suffix in compound words like 电视剧 (TV series), 话剧 (stage play), 悲剧 (tragedy), and 喜剧 (comedy). Note that 剧 also appears as an adjective meaning 'acute' or 'severe' in words like 剧烈 (violent) and 剧痛 (severe pain), but that is a separate usage not covered by this noun entry.