As an adjective suicidal is
pertaining to suicide.
As a noun suicidal is
someone suicidal, someone likely to kill themselves.
Other Comparisons: What's the difference?
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Pertaining to suicide.
(of a person) Likely to commit, or to attempt to commit, suicide.
- He is an authority on the precursors of suicidal behavior.
(informal) Extremely reckless.
- After losing his job, his wife, and his leg in a single week, he became suicidal .
- His driving habits are utterly suicidal .
someone suicidal, someone likely to kill themselves