1) Matter 2) Substance 
(de-na´chәr-әnt) a denaturing agent.
A denaturant is a substance added to intoxicating liquids such as alcohol, so that while they are rendered unfit to drink are still usable in industry. However, the theory behind their use fails to appreciate the desperation of some alcoholics, and the drinking of methylated spirits despite being made more dangerous by the addition of toxic denatur...
[n] - any substance that serves as a denaturing agent
noun any substance that serves as a denaturing agent