Preparatory and Supplementary

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

Supplementary is an antonym for preparatory in introductory topic.

Nearby Words: prepare, preparation, preparing, preparedness, preparative

Supplementary adjective - Available to supply something extra when needed.

Preparatory is an antonym for supplementary.

Nearby Words: supplement, supplemental, supplemented, supplementation