lasting vs perpetual

lasting

adj
  • Persisting for an extended period of time. 

noun
  • A durable woollen material formerly used for women's shoes. 

  • The act or process of shaping footwear on a last. 

perpetual

adj
  • Lasting forever, or for an indefinitely long time. 

  • Set up to be in effect or have tenure for an unlimited duration. 

  • Continuing; uninterrupted. 

  • Flowering throughout the growing season. 

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