Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun watermark

2 senses of watermark

Sense 1
water line, watermark -- (a line marking the level reached by a body of water)
       => line -- (a spatial location defined by a real or imaginary unidimensional extent)

Sense 2
watermark -- (a distinguishing mark impressed on paper during manufacture; visible when paper is held up to the light)
       => marker, marking, mark -- (a distinguishing symbol; "the owner's mark was on all the sheep")