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ch ranjithch ranjith 

what functions are different in formula fields validations rules

Deepak Kumar ShyoranDeepak Kumar Shyoran
I think you asking about the function which exists on validation rule but in formula fields like VLOOPUP.

There is a idea on ida exchange to add this functio in Formala fields hope salesforce will do that in futre release.
Jason Curtis NBSFDGJason Curtis NBSFDG
Good breakdown of the various places formula's are used and some of the differences:

https://developer.salesforce.com/page/An_Introduction_to_Formulas