The root word for educator is educate which means to teach, to train or to supervise a practice by formal instruction to develop skills, profession or trade.
The suffix -or is a word ending added to the stem of a word educate. Suffixes and prefixes are affixes or word endings that can change or add a meaning to the stem of a word being added to. For instance, the word educate. The term "educate" is a verb meaning to teach, but when added by the suffix -or, the verb becomes a noun. It becomes "educator" which now, has a new meaning, a teacher. The difference brought by adding an affix to a stem of word is very obvious.
In the last paragraph, you want to make sure you emphasize your point, as its the last thing the reader is going to remember from it. You may also want to include your own opinion if it is necssary.