Nouns

(n)dummy, silent persona person who does not talk
(n)dumbbell, dummy, dope, boob, booby, pinheadan ignorant or foolish person
(n)dummya figure representing the human form
(n)blank, dummy, blank shella cartridge containing an explosive charge but no bullet

Verbs

(v)dummy, dummy upmake a dummy of“dummy up the books that are to be published”

Adjectives

(s)dummyhaving the appearance of being real but lacking capacity to function“a dummy corporation”