The difference between Eternal and Permanent
When used as nouns, eternal means one who lives forever, whereas permanent means a chemical hair treatment imparting or removing curliness, whose effects typically last for a period of weeks.
When used as adjectives, eternal means lasting forever, whereas permanent means without end, eternal.
Permanent is also verb with the meaning: to perm (the hair).
check bellow for the other definitions of Eternal and Permanent
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Eternal as an adjective:
Lasting forever; unending.
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Eternal as an adjective (philosophy):
existing outside time; as opposed to sempiternal, existing within time but everlastingly
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Eternal as an adjective (dated):
Exceedingly great or bad; used as an intensifier.
Examples:
"some eternal villain"
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Eternal as a noun:
One who lives forever; an immortal.
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Permanent as an adjective:
Without end, eternal.
Examples:
"Nothing in this world is truly permanent."
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Permanent as an adjective:
Lasting for an indefinitely long time.
Examples:
"The countries are now locked in a permanent state of conflict."
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Permanent as a noun:
A chemical hair treatment imparting or removing curliness, whose effects typically last for a period of weeks; a perm.
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Permanent as a noun (linear algebra, combinatorics):
Given an n \times n matrix a_{ij} \,, the sum over all permutations \pi \, of \prod_{i=1}^n{a_{i\pi(i)}}.
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Permanent as a verb (transitive, dated):
To perm (the hair).