How find a word in vector of words?

Hello,

How can find a word in long vector of words, for example:

x=['shoemoney'
    'devices'
    'mcburnett'
    'gdri'
    'ezralevant'
    'Winston80'
    'daniellean'
    'geokem7']; 

Error using vertcat
Dimensions of arrays being concatenated are not consistent.

How find gdri?

Thanks in advance.