Confusable words

like vs as: what's the difference?

like
preposition
vs
as
preposition / conjunction
? ?

Like and as can both introduce a comparison, but only one of them can introduce a real job, role, or function.

Like

preposition

Like means similar to, used for comparisons between different things.

  • She sings like a professional.
  • He runs like the wind.

As

preposition / conjunction

As can describe an actual role or function someone has, not just a comparison.

  • She works as a nurse.
  • He used the box as a chair.

Side by side

like as
Meaning Similar to, but not the same Actually functioning as that thing
Simple test "sings like a professional" means similar to one, but maybe isn't one "works as a nurse" means she really is a nurse
Common error using "as" for a pure comparison using "like" for a real job or role

Quick rule

Like means similar to. As can describe a real role or function. "She sings like a professional" compares her. "She works as a nurse" states a fact.

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