#irritant__thorn  something that causes irritation and annoyance; "he's a thorn in my flesh"
  supertype:  bother__annoyance__nuisance__botheration__pain__pain_in_the_neck__pain_in_the_ass  something or someone that causes trouble; a source of unhappiness; "a bit of a bother"
     supertype:  negative_stimulus  a stimulus with undesirable consequences
        supertype:  stimulus__stimulation__stimulant__input  any stimulating information or event; acts to arouse action
           supertype:  information  knowledge acquired through study or experience or instruction
              supertype:  thing_that_can_be_seen_as_a_relation  usable as relation type
                 supertype:  thing_playing_some_role  category to classify things according to roles/viewpoints; classification under this category is application-dependant
                    supertype:  thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type

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