芝居:しばい: play or theatrical performance - usually used by old people only.

劇 :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, a show

演劇: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。 ???