Like and as can both introduce a comparison, but only one of them can introduce a real job, role, or function.
Like means similar to, used for comparisons between different things.
like full definition →
As can describe an actual role or function someone has, not just a comparison.
as full definition →
| 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 |
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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