The best replacement for crowd is mob.

The best alternatives to crowd are rated as following:
★★★★★  mob
★★★★  crowd
★★  audience
★★  crowds
★★  clique
★  big bang theory
★  throng
★  multitude
★  i.t. crowd
  quantity cooking

Your alternative for crowd is not listed? Suggest!
Speaking about crowd, one probably shouldn't forget about confluence.

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

Scale is based on the average worldwide traffic of crowd in all years. Click on graph for more.
crowd
mob
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