allusive vs mnemonic

allusive

adj
  • that contains or makes use of allusions (indirect references or hints) 

mnemonic

adj
  • Especially of a series of ideas, letters, words, etc.: intended to help in remembering. 

  • Of or relating to memory. 

  • Of or relating to mnemonics (“the study of techniques for remembering anything more easily”). 

noun
  • Something (especially a series of ideas, letters, words, etc.) used to help in remembering a thing; a memory aid. 

  • The human-readable, textual form of an assembly language instruction, not including operands. 

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