Me and my friend have a debate to settle help us?

Ok my friend likes to say ideal as in I have a great ideal
I like to say idea as in I have a great idea

What it the proper use of a sentence like that is it with ideal or idea or does it really matter?
 
wow ur friend is a moron. it is i have a great idea. ideal would be used as

This is an ideal sentence. or an ideal person has ten fingers and 10 toes.
 
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