The best replacement for yet is but.

The best alternatives to yet are rated as following:
★★★★★  but
★★★★  already
★★★  still
★★  not yet
★  however
★  so far
★  and yet
★  jet
★  as of yet
★  nevertheless
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Your alternative for yet is not listed? Suggest!
Speaking about yet, one probably shouldn't forget about tense.

Other search terms related to yet and their ratings are:
★★★★★ tense
★★ present perfect
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