rapid

Noun
  1. A part of a river where the current is very fast (synset 109428274)
Adjective
  1. Done or occurring in a brief period of time (synset 300982888)
    "a rapid rise through the ranks"
  2. Characterized by speed;
    Moving with or capable of moving with high speed (synset 300983053)
    "a rapid movement"; "a speedy car"; "a speedy errand boy"

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