Early and Rudimental

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

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

Rudimental adjective - Of or relating to the simplest facts or theories of a subject.

Early and rudimental are semantically related. Sometimes you can use "Early" instead an adjective "Rudimental".