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"Campaign" means the unit is not a standard unit and is only found in the campaign and custom maps, while "Melee" means it is a standard unit. "Campaign" units often vary from the description of the group (Undead Scourge, for example, has a Pit Lord listed under it). "Special" is usually a summonable or upgraded unit (Spirit Wolf or Berserker).
Note that in Warcraft III the playable races actually referred to factions, and that many other races are included within this playable race.
"Undead" refers mainly to the Scourge, although the Forsaken used mainly Scourge units in Warcraft III (although these two are NOT allies, they are bitter enemies and are played)
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