mussel vs scallop

mussel

noun
  • A freshwater mussel, usually edible, of the order Unionida in subclass Palaeoheterodonta. 

  • A saltwater mussel, usually edible, of the order Mytilida in subclass Pteriomorphia. 

  • Any of certain other bivalves of somewhat similar appearance, such as the zebra mussel and quagga mussel of the family Dreissenidae in subclass Heterodonta. 

scallop

noun
  • Any of various marine bivalve molluscs of the family Pectinidae which are free-swimming. 

  • A form of fried potato. 

  • A dish shaped like a scallop shell. 

  • A fillet of meat, escalope. 

  • One of a series of curves, forming an edge similar to a scallop shell, especially in knitting and crochet. 

verb
  • To create or form an edge in the shape of a crescent or multiple crescents. 

  • To harvest scallops 

  • To bake in a casserole (gratin), originally in a scallop shell; especially used in form scalloped 

How often have the words mussel and scallop occurred in a corpus of books? (source: Google Ngram Viewer )