The best replacement for front kick is roundhouse.

The best alternatives to front kick are rated as following:
★★★★★  roundhouse
★★★  push kick
★★  teep

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Speaking about front kick, one probably shouldn't forget about reverse lunge.

Other search terms related to front kick and their ratings are:
★★★★★ reverse lunge
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Google Trends

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front kick
roundhouse
push kick