As adjectives the difference between affirmative and affirmational
is that affirmative
is pertaining to truth; asserting that something is
; affirming while affirmational
is relating to affirmation.
As a noun affirmative
is yes; an answer that shows agreement or acceptance.
As a noun affirmation
is that which is affirmed; a declaration that something is true.
As an adjective affirmational is
relating to affirmation.