WordNet sense 1 (a mistake in printed matter resulting from mechanical failures of some kind):

erratum, misprint, typo, literal error, typographical error

WordNet sense 2 (being or reflecting the essential or genuine character of something):

actual, genuine, real, real, real

WordNet sense 3 (consistent with fact or reality; not false):

true

WordNet sense 4 (not elaborate or elaborated; simple):

plain