Filter vs Strain

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

Filter

Top 1,000 (very common)C1noun

Strain

Top 2,000 (common)C1noun
Most common: Filter
 FilterStrain
Pronunciation🇬🇧 /["/ˈfɪltə(r)/"]/🇺🇸 /["/ˈfɪltər/"]/🇬🇧 /["/streɪn/"]/🇺🇸 /["/streɪn/"]/
MeaningTo remove unwanted parts from something.To make a lot of effort or to injure a muscle.
Examplean **air/oil filter**The strain on the bridge increased with the heavy traffic.
RegisterNeutralNeutral
How commonTop 1,000 (very common)Top 2,000 (common)
CEFR levelC1C1
Part of speechnounnoun
Collocationsfilter the water, filter out noise, apply a filter, data filter, coffee filterconsiderable, enormous, great, be under, come under, feel, show, take its toll (on somebody), tell (on somebody), under the strain, strain on, a bit of a strain, signs of strain, stresses and strains, considerable, enormous, great, be under, come under, feel, show, take its toll (on somebody), tell (on somebody), under the strain, strain on, a bit of a strain, signs of strain, stresses and strains, bad, slight, back, be suffering from, have, get, new, mutant, virulent, discover, identify, analyse/​analyze, strain of
Antonymscombine, mixrelax, release, ease
Common mistakesConfused with 'sleek' vs 'sleeked', Using 'filtering' without an object, Mistaking 'filter' for 'funnel'Confused with 'stain' when writing., Used as a noun without clarification (e.g., strain of effort)., Incorrectly conjugating in different tenses.
Usage notesUse 'filter' in contexts like photography, manufacturing, or data analysis. It’s appropriate in both everyday and professional settings, but avoid it in very casual conversations.Use 'strain' when discussing physical effort, injuries, or intense focus. Often used in exercise contexts. Avoid using in overly casual situations.

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Strain

Frequently asked questions: Filter vs Strain

What's the difference between Filter and Strain?

Filter: To remove unwanted parts from something. Strain: To make a lot of effort or to injure a muscle.

Which is more common: Filter and Strain?

Filter is the most common in everyday English.

Are Filter and Strain the same CEFR level?

Filter: C1, Strain: C1 on the CEFR scale.

What part of speech are Filter and Strain?

Filter: noun, Strain: noun.

Can you show an example of each?

Filter: an **air/oil filter** Strain: The strain on the bridge increased with the heavy traffic.

Can I use Filter and Strain interchangeably?

Not always. Filter and Strain 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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