rock + work
rockwork (countable and uncountable, plural rockworks)
- Ornamental work done with rocks, as for example around a pond.
2008 May 9, Wendy Moonan, “Rococo Eye-Openers at Two Auction Houses”, in New York Times:
It comes from two French words: rocaille, meaning the irregular rockwork used to decorate fountains and grottoes, and coquillage, shell motifs.