A suspect is someone the police think may be responsible for a crime, before any formal charge has been made. A defendant is the person or party who has been formally accused or sued and is now facing the case in court. In short, a suspect becomes a defendant once the case is brought against them.
The core difference
A suspect is someone believed to be responsible for a crime before charges, while a defendant is the person formally accused or sued in a court case.
- suspect — a person thought to be responsible for a crime: The suspect was taken in for questioning.
- defendant — the person or party being sued or accused in a court case: The defendant pleaded not guilty to all charges.
How to tell them apart
Timing is the clearest way to separate these two. Suspect describes an earlier stage, often during a police investigation, when someone is believed to be involved but nothing has been formally proven or charged. Once that person is formally accused, whether in a criminal charge or a civil lawsuit, they become the defendant, the party actually named in the court case.
Suspect can also work as a verb or an adjective, as in "police suspect the fire was started deliberately" or "his alibi sounded suspect", while defendant is only ever a noun naming the accused party.
