Comment by elashri

It is funny because this is one of the very few words I learned while a kid to construct it from other parts.

So it is "infra" + "structure" but structure is common word so I need to remember how to write "infra" only.

The most bizarre one is the word "yesterday" which I memorized as "yes" + "ter" + "day" and don't ask me why "ter" because I don't remember.