Ensure vs Secure

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

Ensure

Top 2,000 (common) B2 verb

Secure

Top 1,000 (very common) B2 verb

Most common: Secure

	Ensure	Secure
Pronunciation	🇬🇧 /["/ɪnˈʃʊə(r)//ɪnˈʃɔː(r)/","/ɪnˈʃʊəz//ɪnˈʃɔːz/","/ɪnˈʃʊəd//ɪnˈʃɔːd/","/ɪnˈʃʊərɪŋ//ɪnˈʃɔːrɪŋ/"]/ 🇺🇸 /["/ɪnˈʃʊr/","/ɪnˈʃʊrz/","/ɪnˈʃʊrd/","/ɪnˈʃʊrɪŋ/"]/	🇬🇧 /["/sɪˈkjʊə(r)/","/sɪˈkjʊəz/","/sɪˈkjʊəd/","/sɪˈkjʊərɪŋ/"]/ 🇺🇸 /["/sɪˈkjʊr/","/sɪˈkjʊrz/","/sɪˈkjʊrd/","/sɪˈkjʊrɪŋ/"]/
Meaning	To make sure something happens or is true.	To make safe or protect something.
Example	Please ensure that all doors are locked before leaving the building.	We need to secure the doors before we leave for the night.
Register	Neutral	Neutral
How common	Top 2,000 (common)	Top 1,000 (very common)
CEFR level	B2	B2
Part of speech	verb	verb
Collocations	practically, virtually, effectively, must, aim to, try to, an attempt to ensure something, efforts to ensure something, measures to ensure something	easily, safely, eventually, be able to, manage to, fail to, an attempt to secure something, an effort to secure something, be aimed at securing something, firmly, properly, tightly, to, with
Antonyms	neglect, ignore	danger, unsecure, risk
Common mistakes	Confused with 'insure' which relates to insurance., Used incorrectly as a standalone verb without an object., Mispronounced as 'en-sure' instead of 'en-shur'.	Confused with 'ensure' - 'ensure' means to make sure something happens., Using 'secured' as an adjective when it should be a verb., Misplacing the emphasis on the second syllable.
Usage notes	Use 'ensure' when you want to guarantee an outcome or confirm safety. It's appropriate in both spoken and written contexts, though more commonly in formal writing. Avoid using 'ensure' in casual conversations where simpler words like 'make sure' might be more fitting.	Used to indicate making something safe, but can also mean to obtain or achieve something. More common in formal contexts when referring to safety and in neutral situations for obtaining.

See it in real clips

Well, we got the beachhead secure.

We're secure. I want a floor-by-floor search of the entire building.

Well, we got the beachhead secure.

We're secure. I want a floor-by-floor search of the entire building.

Secure

Frequently asked questions: Ensure vs Secure

What's the difference between Ensure and Secure?

Ensure: To make sure something happens or is true. Secure: To make safe or protect something.

Which is more common: Ensure and Secure?

Secure is the most common in everyday English.

Are Ensure and Secure the same CEFR level?

Ensure: B2, Secure: B2 on the CEFR scale.

What part of speech are Ensure and Secure?

Ensure: verb, Secure: verb.

Can you show an example of each?

Ensure: Please ensure that all doors are locked before leaving the building. Secure: We need to secure the doors before we leave for the night.

Can I use Ensure and Secure interchangeably?

Not always. Ensure and Secure 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.