clag vs clart

clag

verb
  • To stick, like boots in mud 

noun
  • Unburned carbon (smoke) from a steam or diesel locomotive, or multiple unit. 

  • Bits of rubber which are shed from tires during a race and collect off the racing line, especially on the outside of corners (cf. marbles). 

  • A glue or paste made from starch. 

  • Low cloud, fog or smog. 

clart

verb
  • To daub, smear, or spread, especially with mud, etc.; to dirty. 

noun
  • A person who is unclean. 

  • A daub. 

  • Unwanted stuff; junk; clutter; rubbish; stuff that is in the way. 

  • Sticky mud, mire or filth. 

  • A fool. 

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