I before E except after C

[Davegre]

I'm sorry...somewhere in my cosmic subliminal brain comes an echo of the mantra "I before E, except after C".

Believe
Deceive

But what are the exceptions to the rule please?

[typo]

Won't give a rule except to say that I instinctly know that those those words have noun forms that use "cept." For example: deceive/deception, receive/reception, conceive/concept(ion). The CEIVE part derives from Latin capere=to take, sieze, catch. What you do when you re-ceive is catch something (like a radio signal); when you con-ceive, you grab any idea (or a baby), etc, etc.

[Wimsey1]

"I" before "E" except after "C" or when it sounds like "A" as in neighbour or weigh.