Faze vs Phase: What's the Difference?

Reviewed by the Grammarlyzer Editorial Team · Our Review Standards · Published June 14, 2026 · Updated July 16, 2026

To faze is to rattle someone; a phase is a stage — and only one of them is about feelings.

⚡ Quick Answer

Faze = to disturb, unsettle, or fluster someone (verb). "Nothing fazes her."

Phase = a stage or step (noun), or to introduce/remove gradually (verb). "a new phase," "phase out plastic."

Memory Trick: Faze affects feelings (F = feelings). Phase is a stage, like the phases of the moon (the "ph" word).

🔑 Key Takeaway

If it is about being rattled or unsettled, use faze. If it is a stage, period, or gradual change, use phase.

Word Type Meaning Example Spelling cue
Faze Verb Disturb / unsettle "It didn’t faze him." F = feelings
Phase Noun A stage or step "the next phase" ph = moon phases
Phase Verb Introduce/remove gradually "phase in the rule" ph = stage

Quick Comparison

Form Use It For Quick Check
Faze Disturbing or unsettling someone Could you replace it with rattle or fluster? Use faze.
Phase (noun) A stage or period Could you replace it with stage? Use phase.
Phase (verb) Gradually starting or stopping Is it "phase in/out"? Use phase.

Common Mistakes

Using "phase" for being unsettled

❌ Incorrect:

The heckling didn't phase the speaker at all.

✓ Correct:

The heckling didn't faze the speaker at all.

To faze someone is to disturb or rattle their composure. Let the f stand for "feelings," then confirm that the sentence describes a person's reaction.

Writing "unphased" for "unbothered"

❌ Incorrect:

She stayed completely unphased by the criticism.

✓ Correct:

She stayed completely unfazed by the criticism.

For the meaning "untroubled" or "undisturbed," use unfazed, built on the verb faze. This advice is about that meaning; it does not make a claim about every possible technical use of unphased.

Using "faze" for a stage or gradual change

❌ Incorrect:

The company will faze out the old product line by spring.

✓ Correct:

The company will phase out the old product line by spring.

A phase is a stage, period, or step, and the verb phase means to introduce or remove something gradually ("phase in," "phase out"). If you're talking about time or sequence rather than emotion, you want phase.

🎯 Test Your Knowledge

1. The heckling did not ____ the comedian.

2. We are entering the testing ____ of the project.

3. She remained completely ____ by the chaos.

4. The state will ____ out gas cars by 2035.

5. Nothing seems to ____ the new manager.

Test It: A Meaning Choice the Checker Missed

The seed uses phase where the intended meaning is "disturb." Test it, then compare the revision with faze.

Manual revision: The tough questions did not faze the candidate at all.

Tested July 16, 2026: both the exact phase seed and the faze revision returned no issues. Because both spellings are words, choose manually by meaning: disturbance → faze; stage or gradual process → phase.

Frequently Asked Questions

Is it "didn’t faze me" or "didn’t phase me"?

Use "didn’t faze me" when you mean that something did not disturb or unsettle you. Phase names a stage or a gradual process, so it does not fit that meaning.

How do I remember which spelling means "unsettle"?

Use the F in faze as a reminder of feelings: faze means to disturb someone's composure. Use phase for a stage, cycle, or gradual introduction or removal.

Should I use "unfazed" or "unphased" for "undisturbed"?

Use unfazed for the meaning undisturbed or untroubled. It is formed from faze, the verb meaning to disturb someone's composure.

Can "phase" be a verb?

Yes. Phase can mean to carry something out in stages. Phase in means introduce gradually, and phase out means remove or stop using gradually.

Did the Grammarlyzer checker flag the tested faze-versus-phase swap?

No. On July 16, 2026, both the phase seed and the faze revision returned no issues. Use the sentence meaning to make this choice manually.

Real-World Examples

🎤 Daily:

The tough crowd didn’t faze her.

Faze = unsettle.
🚀 Business:

The launch enters its final phase next week.

Phase = stage (noun).
🌱 Policy:

The city will phase out single-use plastics.

Phase = remove gradually (verb).
🧗 Daily:

Heights don’t faze experienced climbers.

Faze = disturb.
👶 Daily:

Tantrums are just a phase.

Phase = period.
💼 Business:

He stayed unfazed during the crisis.

Unfazed = unshaken.
❌ Common Mistake:

The setback didn’t phase the team.

Wrong: should be "faze" (unsettle).
❌ Common Mistake:

We will faze in the new policy.

Wrong: should be "phase in" (gradual).

Source-Backed Usage Boundaries

Merriam-Webster's Phase vs. Faze guide distinguishes the noun and staged-process verb phase from the verb faze, meaning to daunt or disconcert. It also documents phase in, phase out, and unfazed.

The Merriam-Webster dictionary entry for faze defines it as disturbing someone's composure and notes that it often appears in negative constructions such as didn't faze and nothing fazes.

The dictionary entry for phase records both the stage or cycle noun and the verb meaning to conduct by planned stages or introduce in stages.

🔗 The Spelling Tell

Faze rattles your feelings — both start with F and are about emotion. Phase is a stage, like the phases of the moon. Feelings → faze; stage → phase.

Why Do People Confuse Them?

Faze and phase are homophones, so sound cannot choose between them. Ordinary spell checking can accept either spelling in isolation because both are words. Replace the word with its intended definition: if disturb fits, use faze; if stage or carry out gradually fits, use phase.

Faze vs phase is a homophone pair that must be decided by meaning, like pour vs pore. For the broader method, see the exact homophones guide.

Related Articles

Check Your Writing Now

Both tested spellings returned no issues, so make the faze-versus-phase choice from meaning, then use the checker for the rest of the sentence.

Try Grammar Checker Free →