bract vs petal

bract

noun
  • A leaf or leaf-like structure from the axil out of which a stalk of a flower or an inflorescence arises. 

petal

noun
  • A lobe of a rose (geometric shape). 

  • One of the component parts of the corolla of a flower. It applies particularly, but not necessarily only, when the corolla consists of separate parts, that is when the petals are not connately fused. Petals are often brightly colored. 

  • Term of endearment. 

verb
  • To spread out from, like the petals of a flower 

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