remnant vs subfamily

remnant

noun
  • The small portion remaining of a larger thing or group. 

  • The remaining fabric at the end of the bolt. 

  • An unsold end of piece goods, as cloth, ribbons, carpets, etc. 

subfamily

noun
  • A secondary or subordinate grouping. 

  • A taxonomic category ranking between a family and a genus; formerly called a tribe 

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