cherub vs imp

cherub

noun
  • A person, especially a child, seen as being particularly angelic or innocent. 

  • A winged creature attending God, described by Pseudo-Dionysius the Areopagite (c. 5th–6th century) as the second highest order of angels, ranked above thrones and below seraphim; similar to a lamassu in the pre-exilic texts of the Hebrew Bible, more humanoid in later texts. 

  • An artistic depiction of such a being, typically in the form of a winged child or a child's head with wings but no body. 

imp

noun
  • A mischievous child. 

  • A small, mischievous sprite or a malevolent supernatural creature, somewhat comparable to a demon but smaller and less powerful, formerly regarded as the child of the devil or a demon (see sense 3.2). 

  • A baby Tasmanian devil. 

verb
  • To add to or unite a object with (something) to lengthen the latter out or repair it; to eke out, enlarge, strengthen. 

  • To provide (someone or something) with wings, hence enabling them or it to soar. 

  • To engraft (a feather) on to a broken feather in a bird's wing or tail to repair it; to engraft (feathers) on to a bird, or a bird's wing or tail. 

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