aroid vs lily of the Nile

aroid

noun
  • Any plant of the family Araceae, found chiefly in the tropics. 

lily of the Nile

noun
  • Zantedeschia aethiopica, a plant species in the family Araceae. 

  • Agapanthus praecox, a plant species in the family Alliaceae. 

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