영화관 = Cinema, Movie house (영화를 볼 수 있는 곳) 극장 = Theater,Playhouse (연극, 뮤지컬, 영화등을 볼 수 있는 곳)

영화관[hanja: 映畵館] = 映画館[えいがかん] http://jpdic.naver.com/search.nhn?ie=utf8&query=%EC%98%81%ED%99%94%EA%B4%80&x=0&y=0&where=all http://hanja.naver.com/search?query=%EC%98%81%ED%99%94%EA%B4%80&x=0&y=0&where=hanja 극장[hanja: 劇場] = 劇場[げきじょう] http://jpdic.naver.com/search.nhn?query=%EA%B7%B9%EC%9E%A5 http://hanja.naver.com/search?query=%EA%B7%B9%EC%9E%A5 By viewing the corresponding kanji(漢字), together with the explanations given by the other respondent, yoo ran, I well believe that you should be able to distinguish the differences between the two terms as a sort of entertainment places. Good day. / 良い 一日を。/ 좋은 일일 을.