Compendious vs Comprehensive
Compendiousadjective
briefly giving the gist of something
The difference
Compendious means concise — covering a subject briefly. Comprehensive means complete — covering all of it. Nearly opposite, despite compendious sounding like it means large.
How to keep them apart
A compendium is short. The word does not mean encyclopaedic, though it is almost always used as if it did.