lemma vs proposal

lemma

noun
  • A proposition proved or accepted for immediate use in the proof of some other proposition. 

  • The outer shell of a fruit or similar body. 

  • One of the specialized bracts around the floret in grasses. 

  • The canonical form of an inflected word; i.e., the form usually found as the headword in a dictionary, such as the nominative singular of a noun, the bare infinitive of a verb, etc. 

  • The theoretical abstract conceptual form of a word, representing a specific meaning, before the creation of a specific phonological form as the sounds of a lexeme, which may find representation in a specific written form as a dictionary or lexicographic word. 

proposal

noun
  • The terms or conditions proposed 

  • A scheme or design 

  • The document on which such a thing is written. 

  • The offer by a party of what he has in view as to an intended business transaction, which, with acceptance, constitutes a contract. 

  • The act of asking someone to be one's spouse; an offer of marriage 

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