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You are completely correct that both are adjectives. Grammatically, English makes a few distinctions when adjectives are used as predicates. Hyphenation is one of those distinctions: compound adjectives are generally not hypenated when used as predicates.
Sometimes there are other formal distinctions as well when adjectives are used as predicates:
(e.g. units singular vs. plural)
the two-year-old child … / This child is two years old.
the three-foot-long ruler … / This ruler is three feet long.
(e.g. can't be predicate)
the main reason / (NOT: This reason is main.)
the former president / (NOT: This president is former.)
(e.g. can only be predicate)
This boat is afloat. / (NOT: The afloat boat … )
This cheese is alone. / (NOT: The alone cheese …)
Martha Barnette
Grant Barrett
Grant Barrett
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