Synonyms for Crenel (same or very similar meaning)
WordNet sense 1 (one of a series of rounded projections (or the notches between them) formed by curves along an edge (as the edge of a leaf or piece of cloth or the margin of a shell or a shriveled red blood cell observed in a hypertonic solution etc.)):
scallop, crenature, crenation, crenelleWordNet sense 2 (supply with battlements):
crenelate, crenellateFrom the ODE community, based on WordNetadd/edit