Friendliness VS friendliness

What is the difference between friendliness and Friendliness?

"friendliness" is an ordinary English word, and Friendliness is a technical term. It is very hard to give a simple definition of Friendliness, nearly as hard as giving a simple definition of "mind". The intuitive definition of Friendliness is that it's a nice, benevolent, white-hat AI that has a positive effect on the universe however you define that. Where you get specific, both in terms of what it means to be Friendly, and in terms of what kind of mind is Friendly, is where it becomes technical. From an operational standpoint, a Friendly seed AI is one that is not inferior in *any* respect to an uploaded altruistic human, in terms of who you want to send to deal with a Hard Takeoff. A Friendly AI is an AI that occupies the basic moral frame of reference that is defined by human altruism and human altruistic philosophies, including the ability to choose between moral frameworks and make improvements to philosophies learned from others. Friendly AI defines a kind of open-ended starting point for nonhuman moral philosophers.

quoted from Wiki Interview With Eliezer

See also Friendliness Theory.