Return repeated words

[Stews]

hi excelers,
I need a simple solution to return any words which appears more than once i.e.

list A1:
cat
boy
lake
cat
=

lake
cat

thanks for any help on this matter...

[Will B]

In B1 enter..

=countif(a1:a5,a1 then PRES CRTL SHIFT and ENTER , enter it as an array. drag down