Derivative instrument and Futures contract

Derivative instrument noun - A financial instrument whose value is based on another security.

Futures contract and derivative instrument are semantically related. In some cases you can replace phrase "Futures contract" with "Derivative instrument", this phrases are similar.

Futures contract noun - An agreement to buy or sell a specific amount of a commodity or financial instrument at a particular price on a stipulated future date; the contract can be sold before the settlement date.

Derivative instrument and futures contract are semantically related. You can use "Derivative instrument" instead a noun phrase "Futures contract".