Alarm vs Warning

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

Alarm

Top 1,000 (very common) B1 noun

Warning

Top 1,000 (very common) B1 noun

	Alarm	Warning
Pronunciation	🇬🇧 /["/əˈlɑːm/"]/ 🇺🇸 /["/əˈlɑːrm/"]/	🇬🇧 /["/ˈwɔːnɪŋ/"]/ 🇺🇸 /["/ˈwɔːrnɪŋ/"]/
Meaning	A loud noise to wake you up or warn you.	A message telling someone about a possible problem or danger.
Example	I set my alarm for 6 AM to wake up early for my workout.	The warning on the label advised against using the product around children.
Register	Neutral	Neutral
How common	Top 1,000 (very common)	Top 1,000 (very common)
CEFR level	B1	B1
Part of speech	noun	noun
Collocations	false, give, raise, sound, call, fire, smoke, burglar, set, activate, set off, go off, ring, sound, bell, clock, system, considerable, great, growing, cause, create, provoke, in alarm, to somebody’s alarm, with alarm, cause for alarm	dire, grim, ominous, give (somebody), issue, post, come, sound, label, notice, sign, in warning, without warning, warning about, let that/​this be a warning (to you), a word of warning, dire, grim, ominous, give (somebody), issue, post, come, sound, label, notice, sign, in warning, without warning, warning about, let that/​this be a warning (to you), a word of warning
Antonyms	calm, peace	safety, assurance, reassurance
Common mistakes	Using 'alarmed' incorrectly as a noun instead of the sound., Confusing 'alarm' with 'alert' in emergency contexts., 'Alarm' can be thought of as both a sound and a noun, varying its usage.	Confused with 'warn' — remember 'warning' is a noun., Using it in a context that doesn't involve danger or caution., Misplacing it in a sentence, leading to unclear meaning.
Usage notes	Use 'alarm' when referring to a sound that alerts someone. It's commonly used for morning wake-ups or emergency situations. Avoid using 'alarm' in very casual contexts unless it refers to a clock.	Use 'warning' when you want to alert someone about something potentially harmful. It's suitable for both spoken and written communication, but avoid using it in overly casual settings.

See it in real clips

I mean, it was like an alarm went off in my head, you know?

Where's the alarm guy?

I mean, it was like an alarm went off in my head, you know?

Where's the alarm guy?

Alarm

The Wire › S1 E1

as a warning to the others.

Better Call Saul › S1 E1

Two-minute warning. Two-minute warning.

Agatha Christies Poirot › S1 E1

Cook was always warning me against them.

The Wire › S1 E1

as a warning to the others.

Better Call Saul › S1 E1

Two-minute warning. Two-minute warning.

Warning

Frequently asked questions: Alarm vs Warning

What's the difference between Alarm and Warning?

Alarm: A loud noise to wake you up or warn you. Warning: A message telling someone about a possible problem or danger.

Are Alarm and Warning the same CEFR level?

Alarm: B1, Warning: B1 on the CEFR scale.

What part of speech are Alarm and Warning?

Alarm: noun, Warning: noun.

Can you show an example of each?

Alarm: I set my alarm for 6 AM to wake up early for my workout. Warning: The warning on the label advised against using the product around children.

Can I use Alarm and Warning interchangeably?

Not always. Alarm and Warning 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.