The best replacement for food chain is food web.

The best alternatives to food chain are rated as following:
★★★★★  food web
★★  food pyramid
★  web
★  food cycle
★  energy pyramid
  life cycle
  detrital food chain
  food wed
  food webs

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Speaking about food chain, one probably shouldn't forget about 4 trophic levels.

Other search terms related to food chain and their ratings are:
★★★★★ 4 trophic levels
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Google Trends

Scale is based on the average worldwide traffic of food chain in all years. Click on graph for more.
food chain
food web
food pyramid