alveolate vs troughlike

alveolate

adj
  • Having a structure containing honeycomb-like cavities. 

noun
  • A member of a grouping of protists comprising the ciliates, sporozoa and dinoflagellates. 

troughlike

adj
  • Resembling or characteristic of a trough. 

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