Turkish

Suffix

-ça

1. Used to form languages from nationalities.

   Rus ‎(“Russian person”) + ‎-ça → ‎Rusça ‎(“Russian language”)

2. Used to form adverbs from adjectives.

   yavaş ‎(“slow”) + ‎-ça → ‎yavaşça ‎(“slowly”)

Usage notes

• It's used when the nationality word's last vowel is one of "a", "ı", "o" or "u" and the last consonant is one of "f", "s", "t", "k", "ç", "ş", "h", or "p"
• It could be -ce, -ca, -çe according to the last vowel and the last consonant of the word.