heart vs kernel

heart

noun
  • The centre, essence, or core. 

  • A wight or being. 

  • A muscular organ that pumps blood through the body, traditionally thought to be the seat of emotion. 

  • A playing card of the suit hearts featuring one or more heart-shaped symbols. 

  • Vigorous and efficient activity; power of fertile production; condition of the soil, whether good or bad. 

  • One's feelings and emotions, especially considered as part of one's character. 

  • The twenty-fourth Lenormand card. 

  • The seat of the affections or sensibilities, collectively or separately, as love, hate, joy, grief, courage, etc.; rarely, the seat of the understanding or will; usually in a good sense; personality. 

  • Emotional strength that allows one to continue in difficult situations; courage; spirit; a will to compete. 

  • A conventional shape or symbol used to represent the heart, love, or emotion: ♥ or sometimes <3. 

verb
  • To form a dense cluster of leaves, a heart, especially of lettuce or cabbage. 

  • To fill an interior with rubble, as a wall or a breakwater. 

  • To be fond of. Often bracketed or abbreviated with a heart symbol. 

kernel

noun
  • The core, center, or essence of an object or system. 

  • The human clitoris. 

  • The nucleus and electrons of an atom excluding its valence electrons. 

  • For a category with zero morphisms: the equalizer of a given morphism and the zero morphism which is parallel to that given morphism. 

  • A set of pairs of a mapping's domain which are mapped to the same value. 

  • A single seed or grain, especially of corn or wheat. 

  • A small mass around which other matter is concreted; a nucleus; a concretion or hard lump in the flesh. 

  • The set of members of a fuzzy set that are fully included (i.e., whose grade of membership is 1). 

  • The central part of many computer operating systems which manages the system's resources and the communication between hardware and software components. 

  • The stone of certain fruits, such as peaches or plums. 

  • A function used to define an integral transform. 

  • The core engine of any complex software system. 

  • The central (usually edible) part of a nut, especially once the hard shell has been removed. 

  • For a given function (especially a linear map between vector spaces), the set of elements in the domain which are mapped to zero; (formally) given f : X → Y, the set {x ∈ X : f(x) = 0}. 

verb
  • To enclose within a kernel 

  • To crenellate 

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