clear as a bell vs perceptible

clear as a bell

adj

  • Totally clear; distinct and unmistakeable, as a bell's tone is clearly heard. 

perceptible

adj

  • Able to be perceived, sensed, or discerned. 

noun

  • Anything that can be perceived. 

How often have the words clear as a bell and perceptible occurred in a corpus of books? (source: Google Ngram Viewer )