Defense vs Immunity

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

Defense

Top 1,000 (very common) B2 noun

Immunity

Top 2,000 (common)

Most common: Defense

	Defense	Immunity
Pronunciation	🇬🇧 /["/dɪˈfens/"]/ 🇺🇸 /["/dɪˈfens/","/ˈdiːfens/"]/	🇬🇧 //ɪˈmjuːn.ɪ.ti// 🇺🇸 //ɪˈmjunɪti//
Meaning	Protection from harm or danger.	The ability of a person to resist disease.
Example	The defense of the castle was stronger than ever after the recent upgrades.	Vaccination enhances your immunity against viral infections.
Register	Neutral	Neutral
How common	Top 1,000 (very common)	Top 2,000 (common)
CEFR level	B2	-
Part of speech	noun
Collocations	military defense, legal defense, strong defense, defense strategy, defense mechanism	immune system, innate immunity, acquired immunity, immunity boost, herd immunity
Antonyms	attack, offense	-
Common mistakes	Confused with 'defence' in British English., Used as a verb instead of a noun., Mispronounced as 'dee-fense' instead of 'de-fense'.	Confused with 'community' when spoken., Using 'immunity' in non-medical contexts., Mispronouncing the word, especially the 'nu' part.
Usage notes	Used in legal, sports, and military contexts. Avoid using in casual conversations that don't involve conflict or protection.	Commonly used in medical or biological contexts. Avoid using in casual conversations unless discussing health.

See it in real clips

...your defense is never down.

Better Call Saul › S1 E1

I'll get your case dismissed. I'll give you the defense you deserve.

The Queen Gambit › S1 E1

like the Sicilian Defense?

...your defense is never down.

Better Call Saul › S1 E1

I'll get your case dismissed. I'll give you the defense you deserve.

Defense

Frequently asked questions: Defense vs Immunity

What's the difference between Defense and Immunity?

Defense: Protection from harm or danger. Immunity: The ability of a person to resist disease.

Which is more common: Defense and Immunity?

Defense is the most common in everyday English.

Can you show an example of each?

Defense: The defense of the castle was stronger than ever after the recent upgrades. Immunity: Vaccination enhances your immunity against viral infections.

Can I use Defense and Immunity interchangeably?

Not always. Defense and Immunity 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.