ABCs and Prefatory

ABCs noun - The elementary stages of any subject (usually plural).

Prefatory and ABCs are semantically related. in simple topic. In some cases you can use "Prefatory" instead an adjective "ABCs", when it comes to topics like elementary.

Prefatory adjective - Coming before the main part or item usually to introduce or prepare for what follows.

ABCs and prefatory are semantically related. Sometimes you can use "ABCs" instead an adjective "Prefatory".