sharp, keen, point
The acme of something is its highest point of achievement or excellence.
Acumen is the ability to make quick decisions and keen, precise judgments.
Acuity is sharpness or clearness of vision, hearing, or thought.
When you suffer from ague, you have a fever and its associated symptoms, such as sweating, chills, and hot stages.
Differentiated vocabulary for your students is just a click away.