atomic bomb vs fusion bomb

atomic bomb

noun
  • A nuclear weapon that obtains its destructive energy from nuclear fission. 

  • The possession of one or more atomic bombs; the ability to launch a nuclear attack. 

fusion bomb

noun
  • An atomic bomb that uses nuclear fusion as a source of energy; a hydrogen bomb 

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