In real estate in the United States, a deed of trust or trust deed is a deed wherein legal title in real property is transferred to a trustee, which holds it as security for a loan (debt) between a borrower and lender. The equitable title remains with the borrower. The borrower is referred to as the trustor, while the lender is referred to as the beneficiary.

Can we conclude that is a deed of trust a security instrument?
yes