Sir I agree....but in some aspect the sound and action of the words changes. "Support" have a strong feeling than "agree".
And sir this is same like the word "objection" and "disagree". So "support" can be include in this category.
For general purpose we can use agree and in some sitution like we do in "objection" ,we can use Support.
...
more... And both words are the part of "opinion" in real world also.
Sir plz, atleast tried this for some...time . Thank you