1) Actualise 2) Actualize 3) Affirm 4) Attest 5) Bear out 6) Confirm 7) Corroborate 8) Embody 9) Shew 10) Show 11) Validate 12) Verify 1) Affirm 2) Confirm 3) Corroborate 4) Give body to 5) Give reality or substance to 6) Make real or concrete 7) Represent in bodily form 8) Solidify, firm, or strengthen 9) Support 10) Sustain 11) To affirm as having substance 12) To embody 13) To record in documents 
• (v. t.) To make to exist; to make real. • (v. t.) To establish the existence or truth of by proof or competent evidence; to verify; as, to substantiate a charge or allegation; to substantiate a declaration.
Sub·stan'ti·ate transitive verb [ imperfect & past participle Substantiated ; present participle & verbal noun Substantiating .] 1. To make to exist; to make real. Ayliffe. 2. To establish the existence or truth...
[v] - solidify, firm, or strengthen
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.
establish or strengthen as with new evidence or facts establish or strengthen as with new evidence or facts[SAT terms] establish or strengthen as with new evidence or facts