Note that the tag wiki for carbonyl-compounds specifically says:
Compounds containing the carbonyl group, C=O. The term is commonly used in the restricted sense of aldehydes and ketones, although it actually includes carboxylic acids and derivatives. (my emphasis)
So, one may argue that all those 33 questions (and in future, any question about carboxylic acids) should be tagged carbonyl-compounds That said, however, carboxylic acids are acids also, so the acid-base tag could serve them just as well. The current tag usage guidelines do not help resolve this issue.