Difference between Imperishable and Permanent

Imperishable

Part of speech: adjective

Definition: Not perishable; not subject to decay; indestructible; enduring permanently; as, an imperishable monument; imperishable renown.

Permanent

Part of speech: noun

Definition: A chemical hair treatment imparting or removing curliness, whose effects typically last for a period of weeks.Given an n \times n matrix a_{ij} \,, the sum over all permutations \pi \, of \prod_{i=1}^n{a_{i\pi(i)}}.

Part of speech: adjective

Definition: Without end, eternal.Lasting for an indefinitely long time.

Example sentence: Nothing is so permanent as a temporary government program.