English UsageGrammar guide
Like vs. As
“Like” and “as” have several uses, but a practical core distinction is that “like + noun phrase” expresses similarity, while “as + noun phrase” expresses a role or function. “As” also works as a conjunction in other structures.
Use “like” for similarity and “as” for a role or function in the core noun-phrase contrast: “like a teacher” versus “as a teacher.”
Key details
As Rolepreposition for role or function and conjunction in other structures
Core Boundarylike = similar to; as + noun = in the role/function of
Like Rolepreposition for similarity before a noun phrase in the core comparison
Further guidance
Role Boundary
Use as + noun phrase for role or function: “works as a consultant.”
Similarity Boundary
Use like + noun phrase for similarity: “works like a charm.”
Sources and evidence
Sources are shown with the role they play in this guide. Historical or style-sensitive claims are kept within the evidence boundary described above.
- Word choice: as or like? — English Grammar Today (opens in a new tab)Cambridge Dictionary · Like for similarity and as for role/function in the relevant noun-phrase patterns