Fluvial
Part of speech: adjective
Definition: Of, pertaining to, inhabiting, or produced by the action of a river or stream
Watercourse
Part of speech: noun
Definition: any channel, either natural or artificial, through which water flows
Fluvial as an adjective is of, pertaining to, inhabiting, or produced by the action of a river or stream while Watercourse as a noun is any channel, either natural or artificial, through which water flows
Part of speech: adjective
Definition: Of, pertaining to, inhabiting, or produced by the action of a river or stream
Part of speech: noun
Definition: any channel, either natural or artificial, through which water flows
We hope you now know whether to use Fluvial or Watercourse in your sentence.