Instillation vs. installation

Both words are nouns in this case.

Instillation (n.) means filling up, implanting, infusing; in another sense, it means inspiring, inculcating. Ex. "The doctor recommended the instillation of eye drops at bedtime."

Installation (n) means putting in place, setting up. Induction, investiture, inauguration. Ex. "The new officers were installed."

When you instill, you put something in, as in medicine. When you install, you set up or build or inaugurate.

My Poor Ears! They're Getting a Workout Today!

Overheard by a professional, American born: "...it was examined in a systemic fashion ..." Wouldn't you prefer systematic???

Pain, My Poor Ears!

Overheard, from a "professional," American born: "Him and his wife told me ..."

Basic! What the heck did you do in elementary school? Him and his wife??? Oh, be still my ears!