Synonyms for Catgut (same or very similar meaning)
WordNet sense 1 (perennial subshrub of eastern North America having downy leaves yellowish and rose flowers and; source of rotenone):
goat's rue, Tephrosia virginiana, wild sweet peaWordNet sense 2 (a strong cord made from the intestines of sheep and used in surgery):
gutFrom the ODE community, based on WordNetadd/edit