My psych teacher thinks developmenting is a word. What should I do?

I am really hoping you misheard or it’s a freudian slip. But nothing you can do really.

Get his a bunch of evidence.

Tell her she's intelligentive.

I wonder if you have simply misheard her saying 'developmental'.

"You say developmenting. I say developmental.".

It is not my job to correct you. Obviously, we have reached an impasse.".

Suggest he/she consults a good dictionary and looks for it.

Of course he/she will never find the word because it does not exist.

Ask him/her to define it.

you aren't in charge of her/his misuse of the language -- do nothing