without fail and without failure
I have learned that the words fail and failure are not interchangeable as nouns? But I feel like without fail and without failure could be interchangeable for the same meaning or is there a preference between them?
Thank you so much as usual in advance.
1 answer 
Failure is the usual noun form; fail in modern English is almost always a verb, except for a very specific meaning having to do with stockbrokers. The usage of fail as a noun to mean failure is obsolete, but survives in the expression without fail. Saying without failure would not be natural because without fail is a set expression.
I hope this helps.
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edited Feb 23 at 09:45
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