cowslip vs pinnule

cowslip

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

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

  • 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 

pinnule

noun
  • Any of the ultimate leaflets of a bipinnate or tripinnate leaf; a subleaflet. 

  • A part or an organ which resembles the barb of a feather, particularly the side branches on the stalks of crinoids; Any of the lateral divisions of the finger-like stalks of an encrinite. 

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