afire vs inflammable

afire

adj

  • On fire (often metaphorically). 

adv

  • On fire (often metaphorically). 

inflammable

adj

  • Capable of burning; easily set on fire. 

  • Incapable of burning; not easily set on fire. 

  • Easily excited; set off by the slightest excuse; easily enraged or inflamed. 

noun

  • Any inflammable substance. 

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