I have now suggested subject-verb-agreement as a synonym for verb-agreement. If this suggestion is accepted, then in the future all questions that people try to tag with subject-verb-agreement will be automatically re-tagged with verb-agreement.
In order to accomplish this, at least four other people with an answer score of 5 or greater in the verb-agreement tag need to vote up the suggestion. Three people have done so already, so we only need one more! They can do that from here: https://english.stackexchange.com/tags/verb-agreement/synonyms
If you don't know what your score is in this tag, you can see it from the "tags" tab on your profile. There is also a list of top answerers for the tag: https://english.stackexchange.com/tags/verb-agreement/topusers
While we're on the subject of agreement and tag synonyms, it seems to me that concord ("Questions about grammatical agreement") should be made a synonym of agreement. Anyone with the requisite reputation can suggest that here: https://english.stackexchange.com/tags/agreement/synonyms