camomile vs chamomile

camomile

noun
  • Any of several other similar plants. (See below) 

  • Matricaria recutita (formerly known as Matricaria chamomilla), German chamomile or Hungarian chamomile, with fragrant flowers used for tea, and as an herbal remedy. 

  • Chamaemelum nobile (formerly Anthemis nobilis), English chamomile or Roman chamomile, a ground cover with fragrant foliage. 

chamomile

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