Mirror vs What's that reflection

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

Mirror

Top 1,000 (very common)A2noun

What's that reflection

Beyond 10,000 (less common)
Most common: Mirror
 MirrorWhat's that reflection
Pronunciation🇬🇧 /["/ˈmɪrə(r)/"]/🇺🇸 /["/ˈmɪrər/"]/🇬🇧 //wɒts ðæt rɪˈflɛkʃən//🇺🇸 //wʌts ðæt rɪˈflɛkʃən//
MeaningA glass surface that reflects images.A reflection is an image seen in a surface like water or glass.
ExampleI looked into the mirror and fixed my hair.What's that reflection in the lake?
RegisterNeutralNeutral
How commonTop 1,000 (very common)Beyond 10,000 (less common)
CEFR levelA2-
Part of speechnoun
Collocationsbathroom, bedroom, compact, use, glance in, look in, reflect something, reveal something, show something, image, reflection, in a/​the mirrorsee a reflection, notice a reflection, ask about a reflection
Antonymswindow-
Common mistakesConfused with 'miror' — correct spelling is 'mirror'., Used as a verb incorrectly; 'to mirror' means to reflect but it’s not common in everyday conversation., Incorrectly translating to 'speculum' in contexts where 'mirror' is the correct term.Omitting 'that' - saying 'What's reflection?', Using 'who' instead of 'what' in this context, Confusing with 'refraction' (light bending)
Usage notesUse 'mirror' when talking about making a reflection or when someone looks at their appearance. In formal writing, it's often used metaphorically, but in everyday conversation it's very common.Use when asking about an image seen in a surface. Suitable for casual conversations and more formal contexts.

See it in real clips

Mirror
What's that reflection

Frequently asked questions: Mirror vs What's that reflection

What's the difference between Mirror and What's that reflection?

Mirror: A glass surface that reflects images. What's that reflection: A reflection is an image seen in a surface like water or glass.

Which is more common: Mirror and What's that reflection?

Mirror is the most common in everyday English.

Can you show an example of each?

Mirror: I looked into the mirror and fixed my hair. What's that reflection: What's that reflection in the lake?

Can I use Mirror and What's that reflection interchangeably?

Not always. Mirror and What's that reflection 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.

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