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invariable vs hard-and-fast

hard-and-fast vs invariable

invariable is a noun but hard-and-fast is not a noun.

invariable and hard-and-fast both are adjectives.

Word NounAdjectiveVerbAdverb
invariable Yes Yes No No
hard-and-fast No Yes No No
invariable (noun) hard-and-fast (noun)
a quantity that does not vary
invariable (adjective) hard-and-fast (adjective)
not liable to or capable of change (of rules) stringently enforced
Difference between invariable and hard-and-fast

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