disguise
US /dɪsˈɡaɪz/
UK /dɪsˈɡaɪz/

1.
give (someone or oneself) a different appearance in order to conceal one's identity
:
•
He tried to disguise his voice on the phone.
•
She wore a wig and glasses to disguise herself.
1.
a means of concealing one's identity or the true nature of something
:
•
He wore a clever disguise to the party.
•
Her calm demeanor was a disguise for her nervousness.