Defence vs Protection vs Security vs Shield

When to use each in English, with meaning, register, and examples.

Defence

Top 3,000 (common)B2noun

Protection

Top 1,000 (very common)B2noun

Security

Top 1,000 (very common)B1noun

Shield

Top 2,000 (common)
 DefenceProtectionSecurityShield
Pronunciation🇬🇧 /["/dɪˈfens/"]/🇺🇸 /["/dɪˈfens/","/ˈdiːfens/"]/🇬🇧 /["/prəˈtekʃn/"]/🇺🇸 /["/prəˈtekʃn/"]/🇬🇧 //sɪˈkjʊə.rɪ.ti//🇺🇸 //sɪˈkjʊr.ɪ.ti//🇬🇧 //ʃiːld//🇺🇸 //ʃiːld//
MeaningProtection from harm or danger.Keeping something safe from harm.Protection from danger or harm.A protective barrier or device.
ExampleThe team's defence was strong, preventing the opposing players from scoring any goals.The protection of wildlife is essential for biodiversity.The company invests heavily in data security to protect customer information.The soldier raised his shield to block the arrows.
RegisterNeutralNeutralNeutralNeutral
How commonTop 3,000 (common)Top 1,000 (very common)Top 1,000 (very common)Top 2,000 (common)
CEFR levelB2B2B1-
Part of speechnounnounnoun
Collocationsadequate, effective, immune, come to, leap to, rush to, in defence of, defence against, weapons of defence, effective, strong, coastal, put up, bolster, improve, mechanism, defence against, capability, establishment, force, good, robust, solid, conduct, make, mount, attorney, counsel, lawyer, in somebody’s defence, defence of, defence to, counsel for the defence, good, robust, solid, conduct, make, mount, attorney, counsel, lawyer, in somebody’s defence, defence of, defence to, counsel for the defence, good, solid, staunch, play, put up, destroy, in defence, on defenceprovide protection, seek protection, get protection, legal protectionsecurity measures, data security, personal security, national security, security systemprotective shield, energy shield, personal shield, combat shield, shield wall
Antonymsattack, offenseexposure, riskdanger, risk, insecurityattack, assail, expose
Common mistakesConfused with 'defense'; remember 'defence' is British English., Incorrectly using as a verb; 'defence' is a noun., Mispronouncing the ending; ensure the 'ce' sounds like 's'.Confusing with 'protect', which is a verb., Using 'protection' without a specific context, like 'against threats'.Confusing security with safety - security is more about protection against threats., Using 'security' as a verb instead of a noun., Mispronouncing the word, especially the second syllable.Confusing 'shield' with 'shelter' – they have different meanings., Using 'shield' as a verb without an object., Confusing the types of shields in gaming or sports.
Usage notesUsed in both formal and informal contexts. Common in legal, sports, and military discussions. Avoid in casual conversations unless relevant.Use this word when discussing safety measures or legal shields. Not usually used in very casual speech.Commonly used in contexts related to safety, such as cybersecurity, personal safety, or physical safety. It is appropriate in both formal and informal situations.Use 'shield' when discussing protection, both physical and metaphorical. It is often used in contexts like law, gaming, and safety. Avoid using it in overly casual settings where simpler terms are more suitable.

See it in real clips

Defence
Protection
Security
Shield

Frequently asked questions: Defence vs Protection vs Security vs Shield

What's the difference between Defence, Protection, Security, and Shield?

Defence: Protection from harm or danger. Protection: Keeping something safe from harm. Security: Protection from danger or harm. Shield: A protective barrier or device.

Can you show an example of each?

Defence: The team's defence was strong, preventing the opposing players from scoring any goals. Protection: The protection of wildlife is essential for biodiversity. Security: The company invests heavily in data security to protect customer information. Shield: The soldier raised his shield to block the arrows.

Can I use Defence, Protection, Security, and Shield interchangeably?

Not always. Defence, Protection, Security, and Shield are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.

Related comparisons