auricula vs cowslip

auricula

noun
  • The ornamental primrose Primula auricula 

  • The external part of the ear. 

  • A small conical pouch projecting from either atrium of the heart. 

  • A pronounced thickening at the corner of a trilete spore, beyond the end of the laesura. 

cowslip

noun
  • Primula deorum, a flowering plant known as God's cowslip and rila cowslip 

  • A low-growing plant, Primula veris, with yellow flowers. 

  • Primula florindae, a flowering plant known as giant cowslip and Tibetan cowslip 

  • marsh marigold, Caltha palustris, a plant in the buttercup family, growing in wet, boggy locations. 

  • Pulmonaria angustifolia, blue cowslip or narrow-leaved lungwort 

  • Primula sikkimensis, a flowering plant known as Himalayan cowslip and Sikkim cowslip 

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