When tagging and the tag is not there but there is a tag containing the word, it does not let you add it from the select tag dropdown, a work around would be to add a . or something that differentiates the word from the already added tag. Would be good to be able to add it when it is not the same exact word.

Hi Angelo! Could you expand a bit, maybe using screenshots, on what you mean? I assume this is in the Tagging module using Form Based Tagging, and presumably within a Select question.