Suffixation is the formation of new words by adding suffxes to stems. Suffixes generally change the word class. For example, "employ" is a verb, but"employer" becomes a noun when the suffix -er is added to the stem"employ".
词缀是在词干上加词缀而形成新词的过程。后缀改变了词类而不是它的意思。例如，employ（雇用）是动词，但是当加了后缀-er的时候就变成了名词employer（雇主）。
