Today’s similarly written words have no similarities when it comes to meaning. I used to mix up those two words sometimes.
Impede [im-peed] (verb):
to hinder or obstruct.
My online window shopping spreeimpeded my work on my graduation.
Impend [im-pend] (verb):
1. to be imminent or about to happen.
2. to threaten or menace.
I summoned all my energy and focus as the deadline to my graduation project impended.