security
1 asylum, care, cover, custody, immunity, preservation, protection, refuge, retreat, safekeeping, safety, sanctuary
2 defence, guards, precautions, protection, safeguards, safety measures, surveillance
3 assurance, certainty, confidence, conviction, ease of mind, freedom from doubt, positiveness, reliance, sureness
4 collateral, gage, guarantee, hostage, insurance, pawn, pledge, surety
Antonyms
1, 2 & 3 exposure, insecurity, jeopardy, uncertainty, vulnerability