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We all know that this word is spelled correctly:proper.

In my mind, the base word is prop and the suffix-er is added. In looking at the Big Suffix Checker I follow this sequence: does the suffix begin with a vowel letter? (Yes), does the word taking the suffix end with a vowel letter? (No), does the word taking the suffix end with <w> or <x>? (No), does the word taking the suffix end with a single consonant letter? (Yes), is there just one vowel before that? (Yes), is the word taking the suffix a monosyllable? (Yes). The direction is to double the last letter before adding the suffix. But we know that propper is incorrect. 

What am I missing?

 

Thank you!

Deb