cous vs cowish

cous

noun
  • cousin (usually as a term of address, but not necessarily towards one's cousin) 

cowish

adj
  • timorous; fearful; cowardly 

noun
  • An umbelliferous plant (Lomatium cous) with edible tuberous roots, found in Oregon, USA. 

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