Dummy
/ˈdʌmi/
noun
A silent person; a person who does not talk.
An unintelligent person.
“Don't be such a dummy!”
A figure of a person or animal used by a ventriloquist; a puppet.
Synonyms: dumbie, dumbie, juke, mannequin, marionette
verb
To make a mock-up or prototype version of something, without some or all off its intended functionality.
“The carpenters dummied some props for the rehearsals.”
To feint.
Synonyms: juke