What is the suffix for distinction?

There isn't one specific suffix for "distinction". However, there are a few ways to add a suffix to create related words, depending on the meaning you want to convey:

For "quality of being distinct":

* -ness: distinctness (a state of being distinct)

* -ity: distinctivity (the quality of being distinctive)

For "act of distinguishing":

* -tion: distinction (the act of recognizing a difference)

For "marked by distinction":

* -ed: distinguished (having achieved eminence)

For "one who distinguishes":

* -er: distinguisher (someone who identifies differences)

So, the specific suffix you choose depends on the specific meaning you want to convey.