beret, beanie, baseball cap; see hat.
top, lid, stopper; see cover 1.
dose, pill, tablet, caplet; see medicine 2, tablet 3.
Another word for cap
The highest point: apex, crest, crown, height, peak, roof, summit, top, vertex. See high
To put a topping on: crown, top, top off. See over, put on
To extend over the surface of: blanket, cover, overlay, spread. See put on
To reach or bring to a climax: climax, crest, crown, culminate, peak, top (off or out). See excite