lamentation vs weeper

lamentation

noun
  • A sorrowful cry; a lament. 

  • Specifically, mourning. 

  • The act of lamenting. 

  • A group of swans. 

  • lamentatio, (part of) a liturgical Bible text (from the book of Job) and its musical settings, usually in the plural; hence, any dirge 

weeper

noun
  • A pleurant. 

  • A weeping tree. 

  • A white border round the sleeve of a mourning dress. 

  • A widow's crape veil. 

  • A hired mourner. 

  • A thing that slowly leaks liquid. 

  • A person who weeps. 

  • A crape hatband. 

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