Early and Underived

Early adjective - Relating to or occurring near the beginning of a process, series, or time period.

Underived and early are semantically related In some cases you can use "Underived" instead an adjective "Early".

Underived adjective - Not derived; primary or simple.

Early and underived are semantically related in ancient topic. Sometimes you can use "Early" instead an adjective "Underived", if it concerns topics such as earliest.