What is the difference between acyl, acetyl, and enoyl?

Answer 1

http://en.wikipedia.org/wiki/Acyl
http://en.wikipedia.org/wiki/Acetyl

http://128.240.24.212/cgi-bin/omd?enoyl

Answer 2

I already googled and read those exact pages before posting.

Acyl and Acetyl look like the exact same thing yet they have completely different Wikipedia pages. I get the feeling that there is some difference that I am not seeing.