Question 1
The suffix -er appears in words like teacher and
writer. With many verbs borrowed from Latin, the same suffix
appears as -or, as in actor and narrator.
What does this suffix mean?
"-er" and "-or" both mark a word as a noun naming the
person who performs an action. Teacher = one who teaches;
actor = one who acts. The form "-or" tends to appear with
verbs borrowed from Latin (act → actor), while "-er"
tends to appear with Germanic-rooted verbs (teach → teacher).