2. 讨论: discuss with others, between two people or in a group;
4. 评论: comment on sb./sth.
5. 结论: usually used as a noun, means conclusion.
6. 争论: argue with others about sth.intensively
7. 议论: many people (more than 2) express or exchange their opinion on sth. together
9. 谈论: similar with 议论, but not that many people
10. 辩论: similar with 争论, but usually in the form of a debate
12. 言论: expression of opinion
13. 试论: try to comment on sth, usually used in essays to show modesty
17. 推论: a further conclusion based on the previous one
19. 纵论: express one's opinion freely with nothing to fear
22. 立论: to set one's idea as a statement or theory
23. 政论: standpoints related with policy
25. 绪论: introduction part of a book
26. 定论: final conclusion, unchangable
30. 通论: general knowledge
33. 并论: talk about two things together or compare them(usually say 相提并论)
90. 终论:final opiniton
120. 讲论: talk about your opinion. explain(similar with 谈论, used in the ancient time)
126. 成论: similar with 定论, not used now
127. 异论: odd statements which are differnet from the general knowledge
128. 具论: discuss sth. in detail (ancient)
135. 要论: key points in a theory or sth.
190. 宏论: intelligent views expressed by knowledgeable people
Other words are mainly used in the ancient time.