Lots vs Mass

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

Lots

Top 1,000 (very common)

Mass

Top 1,000 (very common)B2noun
 LotsMass
Pronunciation🇬🇧 //lɒts//🇺🇸 //lɑts//🇬🇧 /["/mæs/"]/🇺🇸 /["/mæs/"]/
MeaningMany or a large number of something.A large amount of something.
ExampleThere are lots of stars in the night sky.The mass of the object was measured in kilograms.
RegisterNeutralNeutral
How commonTop 1,000 (very common)Top 1,000 (very common)
CEFR level-B2
Part of speechnoun
Collocationslots of information, lots of fun, lots of people, lots of work, lots of choicesenormous, great, huge, mass of, masses of, the huddled masses, the unwashed masses, enormous, great, huge, mass of, masses of, the huddled masses, the unwashed masses, enormous, great, huge, mass of, masses of, the huddled masses, the unwashed masses, enormous, great, huge, mass of, masses of, the huddled masses, the unwashed masses, enormous, great, huge, mass of, masses of, the huddled masses, the unwashed masses, atomic, molecular, body, measure, add, gain
Antonymsfew, littlefew, scarcity, lack
Common mistakesUsing 'lot' instead of 'lots' when referring to multiple items., Confusing 'lots' with 'a lot', which has a different grammatical usage.'Mass' used incorrectly as a verb. It's primarily a noun., Confusion between 'mass' as in a lot of something and 'mass' as in the physical property., Overuse in contexts where 'countable nouns' are discussed.
Usage notesUse 'lots' in informal contexts. It can sound casual or friendly but can be less appropriate in formal writing.Used in both scientific and everyday contexts. Avoid using in very casual conversations where simpler words like 'lots' or 'bunch' could work better.

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Lots

Frequently asked questions: Lots vs Mass

What's the difference between Lots and Mass?

Lots: Many or a large number of something. Mass: A large amount of something.

Can you show an example of each?

Lots: There are lots of stars in the night sky. Mass: The mass of the object was measured in kilograms.

Can I use Lots and Mass interchangeably?

Not always. Lots and Mass 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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