who's

[ hooz ]
/ huz /

contraction of who is: Who's there?
contraction of who has: Who's seen it?

Can be confused

who's whose (see usage note at whose)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for who's

who's

/ (huːz) /

contraction of

who is
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012