WordNet sense 1 (the upper branches and leaves of a tree):

treetop, capitulum

WordNet sense 2 (the top point of a mountain or hill):

crest, peak, summit, tip, top

WordNet sense 3 (the award given to the champion):

pennant

WordNet sense 4 (the top of the head):

pate, poll, pate, poll

WordNet sense 5 (an ornamental jewelled headdress signifying sovereignty):

diadem

WordNet sense 6 (invest with regal power; enthrone):

coronate