Hi Osee,
Perhaps, I added more confussion than I wanted to when I commented about 'Student Math-Club'.
It is not the mode (singular vs. plural) that carries the meaning of belonging vs. that of responsibility. For example, a product manager (singular noun acting as an adjective) is responsible for one product line. It is the meaning / idea / message that an entity (person / group / organization / etc...) wants to convey. Therefore, you might find
Teacher Union and Teachers Union are used in the names of many organizations.
Now, back to your comment about the meaning of
Teachers Union to carry the responsibility connotation, using my logic; then I must say that my explanation was poorly presented and became an un-intended logic. So what is the difference between the two naming styles? I would venture to interpret that:
- Teacher Union is an organization for teachers without any distinction what sort of teachers they are.
- Teachers Union is an organization in which teachers could be classified into various groups.
In short, I feel the name Teachers Union has a grander connotation than that of Teacher Union, just like Sales Engineer convey bigger image than Sale Engineer. More importantly, I would like emphasize that the modifier in a compound noun could be either singular or plural. Semantically, the use of one mode might prevail over the other, but I don't know any grammar rule preventing us from using either mode.
Comments anyone?
Thanks,
Hoa Thai
P.S. As an ESL learner, I would appreciate if you all can help me refine my writings. I come to this site for learning and sharing. I believe that I can improve my skills quicker when you point out my mistakes. If you do feel that your help might de-focus the issue, please email me. Thanks in advance.