What is the face value of a 1935 D US 1 dollar silver certificate?

The face value of any bill or coin simply refers to its denomination, so the face value of any $1 bill is one dollar (and the face value of a quarter is 25¢, of a penny is 1¢, and so on.)

The collector or market value of a bill or coin is what it's actually worth to a collector on the open market. For that information, please see the Related Question.

In the case of a rare item the market value is almost always higher than the face value. Common items - e.g. a circulated 2010 dime - have no extra market value so their face value is the same as their value to a collector. And in some cases, for example obsolete currency that's not in high demand, the face value can be more than the collector value.