What are some opinion words?
Your question is so vague that I don't know what you want.
Check this site to see if it's what you need.
http://www.e-tme.com/opinion%20signal%20words%20-%20sample.htm
Check this site to see if it's what you need.
http://www.e-tme.com/opinion%20signal%20words%20-%20sample.htm