Are there any labels that a..

My Pervious IQ question got me to thinking about labels. Are there any labels that are always correct? If you say yes then please list some examples. Everything I can think of always as an exception. .know any that don't?

On a smiliar note, should we even use labels at all? Should kids at school be considered smart or dumb or average (when different people excell in different areas)? Should a person be considered white, black, or brown (when black people can have white skin pigments that are prominent on certain parts of their body)? Should a person be considered religious/believer or non-religious/non-believer (when at some point everyone has doubts about their beliefs)?

No, there are no labels that are always correct. Because if they were always correct then that would be scientific fact and truth.