The best replacement for sophomore is junior.

The best alternatives to sophomore are rated as following:
★★★★★  junior
★★★  sophomore
★★★  sophmore
★★★  freshman nba
★★  freshman
★  rookies
★  rookie
★  rookie 2011
  southmore
  freshman college

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Speaking about sophomore, one probably shouldn't forget about freshman.

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

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sophomore
junior
sophomore