dessertspoon vs soupspoonful

dessertspoon

noun
  • More generally, that volume of a substance which is contained within a dessert spoon. 

  • A unit of measure, being equivalent to two teaspoons or two-thirds of a tablespoon, or approximately 10 millilitres; a dessertspoonful. 

  • An item of cutlery; a spoon, larger than a teaspoon and smaller than a tablespoon, used for eating dessert. 

soupspoonful

noun
  • The amount that may be held by a soupspoon. 

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