suffix
/ˈsəfɪks/
an affix that is added at the end of the word
中文释义：后缀；词尾
Adding the suffix '-ness' to an adjective forms a noun.
在形容词后加后缀 '-ness' 构成名词。
English learners often struggle with verb suffixes like '-ed' and '-ing'.
英语学习者常对 '-ed' 和 '-ing' 等动词后缀感到困难。