Ending Added to a Word, E.g. -Tion, -Ing

This page is the CodyCross answer for the clue below from TV Station, Group 611, Puzzle 3 (Black Mirror).

Question is: Ending Added to a Word, E.g. -Tion, -Ing

and the answer is: SUFFIX

Word Meaning:

SUFFIX — (grammar, linguistic morphology) A morpheme added at the end of a word to modify the word's meaning.

Definitions from Wiktionary.