a bit vs if anything

a bit

adv
  • Slightly; rather. 

  • To a small extent; in a small amount. 

  • Very. 

  • A lot. 

if anything

adv
  • Used to suggest or state tentatively that something may be the case (often the opposite of something previously implied). 

  • Used in questions when the speaker does not know for sure if the listener will have an answer. 

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