Deserter (, n.
One who forsakes a duty, a cause or a party, a friend, or any one to whom he owes service; especially, a soldier or a seaman who abandons the service without leave; one guilty of desertion.
Shades of meaning
Fernald lists deserter only as an antonym, under adherent.
He lists it without comment; the entries above explain its neighbors.
Synonyms
none given