Firebird Documentation Index → Firebird 1.5 Language Ref. Update → Reserved words → Added in 1.0 but removed in 1.5
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Added in 1.0 but removed in 1.5

The following reserved words were added in Firebird 1.0 but removed again in 1.5:

BREAK
DESCRIPTOR
FIRST
SKIP
SUBSTRING

The following non-reserved words were earmarked in Firebird 1.0 as “to be avoided because of future reservation”, but no longer so in 1.5:

COALESCE
IIF
NULLIF

(of these three, COALESCE and NULLIF are non-reserved keywords in 1.5)

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Firebird Documentation Index → Firebird 1.5 Language Ref. Update → Reserved words → Added in 1.0 but removed in 1.5