Acid-fast and Runproof

Acid-fast adjective - Not easily decolorized by acid solutions; pertains to micro-organisms (especially the tubercle bacillus that causes tuberculosis).

Runproof and acid-fast are semantically related. In some cases you can use "Runproof" instead an adjective phrase "Acid-fast".

Runproof adjective - (of hosiery) resistant to runs or (in Britain) ladders.

Acid-fast and runproof are semantically related. You can use "Acid-fast" instead an adjective "Runproof".