theater, play

(しばい) Play or theatrical performance – usually used by old people only.
(げき) A play. (NOT used about kabuki or noh. – you got to say kabuki or noh if that’s what you mean!)
ショー A Broadway musical
(えんげき) Pretty much the same as 劇:but a little more formal? Shakespeare is 演劇、 but a school play or Christmas pageant is 劇.