Is Substantiating a Verb?

verb (used with object), sub·stan·ti·at·ed, sub·stan·ti·at·ing. to establish by proof or competent evidence: to substantiate a charge. to give substantial existence to: to substantiate an idea through action. to affirm as having substance; give body to; strengthen: to substantiate a friendship.

Is equivalent a noun or verb?

EQUIVALENT (noun) definition and synonyms | Macmillan Dictionary.

What are substantiations?

noun. evidence sufficient to establish a thing as true, valid, or real; proof: The department may require employees to provide vouchers, receipts, or other substantiation for any fees or expenses claimed.