Dict
Meaning: Say
Words: Dictionary, Diction, Contradict, Predict
Cred
Meaning: Believe
Words: Incredible, Credit, Credo, Credibility
Cent
Meaning: One Hundred/100
Words: Century, Cent, Centimeter, Centipede
Neo
Meaning: New
Words: Neonatal, Neoclassic, Neolithic
Ad
Meaning: To
Words: Addendum, Addition, Add, Adapt