Open
Open adjective - Allowing passage without obstruction.
Secure
Secure adjective - Not exposed to the threat of loss or injury.
Usage example: the fortress was thought to be secure against attack
Common collocations
Both words in one sentence
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A secure vault will release sleep gas if one of the necessary combinations to open it is not entered correctly.
Source: Knockout Gas - All the books were chained to the shelf save one, open on the table at a page entitled How to secure a room from the inside.
Source: Locked Room Mystery - The doors open only for the player who installed them, turning any building into a secure hiding place or storage area.
Source: A Homeowner Is You
Cite this Source
Secure and Open. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/open/secure
Open & Secure. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/open/secure>.
Secure or Open. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/open/secure.
Google Ngram Viewer shows how "open" and "secure" have occurred on timeline