effectual. sound.
A synonym for contraband is illegal. An antonym for contraband is legal.
Legal
Legitimate is also legal, licit, and valid
undertaking, execution, pursuit, accomplishment, pursuance
A synonym for valid could be credible or legal.
it means someone who is past their legal age
A synonym for domicile is legal residence. A domicile is a permanent, rather than a temporary, residence.
Legal, lawful, permissible, and authorized are synonyms of licit.
A process server is someone who gives legal notice to an individual involved in a legal proceeding. In many jurisdiction, only a sheriff or marshall can carry out this task, so sheriff or marshall would be another name for a process server.
Some synonyms for judiciary include "judicial," "legal," and "court." One antonym is "non-judiciary." With respect to branches of government, antonyms might include "legislature" or "legislative" and "executive."
Words that can be synonyms for legitimate are legal, official, genuine, actual, true, or real.
Justice (concept) -- fairness, equality, equity Justice (legal) -- due process, legality