1) Diviner 2) Diviner, of a sort 3) Divining one 4) Divining rod 5) Divining rod wielder 6) One with a rod 7) Rhabdomancer 8) Water seeker 9) Water witch Found on https://www.crosswordclues.com/clue/dowser
Dows'er noun 1. A divining rod used in searching for water, ore, etc., a dowsing rod. [ Colloq.] 2. One who uses the dowser or divining rod. Eng. Cyc. Found on http://www.encyclo.co.uk/webster/D/116