overcrowd vs tamp

overcrowd

verb
  • To fill beyond reasonable limits, with people, animals, objects or information. 

tamp

verb
  • To drive in or pack down by frequent gentle strokes 

  • To reduce the intensity of. 

  • To plug up with clay, earth, dry sand, sod, or other material, as a hole bored in a rock. 

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