The best replacement for retweet is reply.

The best alternatives to retweet are rated as following:
★★★★★  reply
★★★★  rt
★★★  favorite
★★★  quote
★★★  re-tweet
★★  quote tweet
★  reply on twitter
★  tweet
★  quoted retweet
★  reply twitter
★  subtweet
  favoriet

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Speaking about retweet, one probably shouldn't forget about comment twitter.

Other search terms related to retweet and their ratings are:
★★★★★ comment twitter
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