1. (n.) The swell of the sea which breaks upon the shore, esp. upon a sloping beach.

2. (n.) The bottom of a drain.

billow bore breakers chop choppiness chopping sea collar comb comber dirty water eagre foam froth gravity wave ground swell head heave heavy sea heavy swell lather lift lop meringue mousse offscum peak popple puff riffle ripple rise roll roller rough water scend scud scum sea sea foam send soapsuds souffle spindrift spoondrift spray spume stinging suds surge swell tidal bore tidal wave tide wave trough tsunami undulation water wave wave wavelet white horses white water whitecaps