acid-resistant vs antacid

acid-resistant

adj

  • able to withstand the effects of acids 

antacid

adj

  • Counteracting or neutralizing acidity, especially in the stomach. 

noun

  • An agent that counteracts or neutralizes acidity, especially in the stomach. 

How often have the words acid-resistant and antacid occurred in a corpus of books? (source: Google Ngram Viewer )