discriminator

1. A person who discriminates, as:

   A person who differentiates things or concepts.

   keen discriminator

   a person who (or that which) differentiates

2. A person who acts unfairly through prejudice.

   I am not a discriminator

3. A test or variable, etc. that serves to distinguish between different things.

   Colour is not an effective discriminator when it comes to the spiciness of food.

4. Any of several electronic devices that convert some property of a signal into an amplitude whose value is proportional to the difference between the value of the input signal and that of a standard.

5. A feature of the seller's offering that differs from a competitor's offering and is important to the buyer in question.

   An especially strong warranty can be a discriminator in some marketplaces.

regular