The best replacement for four leaf clover is shamrock.

The best alternatives to four leaf clover are rated as following:
★★★★★  shamrock
★★★★  three leaf clover
★  three

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Speaking about four leaf clover, one probably shouldn't forget about horseshoe.

Other search terms related to four leaf clover and their ratings are:
★★★★★ horseshoe
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Google Trends

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four leaf clover
shamrock
three leaf clover