The best replacement for jock is nerd.

The best alternatives to jock are rated as following:
★★★★★  nerd
★★★★  compression shorts
★★★  geek
★★  nerds
★★  prep
★★  athlete
★  jock
★  skater
★  montego
★  no jock
  pro rock

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Speaking about jock, one probably shouldn't forget about jock.

Other search terms related to jock and their ratings are:
★★★★★ jock
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Google Trends

Scale is based on the average worldwide traffic of jock in all years. Click on graph for more.
jock
nerd
compression shorts