thematic vs topical

thematic

adj
  • Relating to, or having a theme (“subject”) or a topic. 

  • Relating to a melodic subject. 

  • Of or relating to a theme (“subdivision of the Byzantine empire”). 

  • Of a word stem, ending in a vowel that appears in or otherwise influences the noun or verb's inflection. 

noun
  • A postage stamp that is part of a thematic collection. 

topical

adj
  • Relating to a particular topic or subject. 

  • Arranged according to topic or theme; thematic. 

  • Applied to a localized part of the body. 

  • Local to a particular place 

  • Applied externally (to the surface of the skin or eye). 

  • Relating to a topic or subject of current interest. 

noun
  • A joke dealing with current events or topical subjects. 

  • A postage stamp depicting a particular theme or subject (such as birds or trains), potentially sought out by topical stamp collectors. 

  • A substance, especially a medication, applied externally (to the surface of the skin or eye). 

  • A topical anaesthetic. 

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