murdernoun(CRIME)
[ C ]
a person who has killed themselves intentionally:
He proved that the two "suicides" were in fact murdered.
All the evidence points to suicide.所有的证据都表明可能是自杀。
The family were shattered at the news of Annabel's suicide.
The state had presented no evidence against the three suicides.

suicidenoun (DAMAGING YOURSELF)

[ U ]
any act that has the effect of causing your own defeat: 自杀性行为；自取灭亡的行为
[ + to infinitive ]As a leader he knows that it is political suicide to appear indecisive.他知道作为一位领袖表现得犹疑不定无疑是在政治上自取灭亡。
career suicidePublicly battling with your record company can be career suicide.

suicide | American Dictionary

suicide
noun[ C/U ]
us/ˈsu·əˌsɑɪd/
the act of killing yourself intentionally:
[ U ]She threatened to commit suicide.
Suicide can also refer to any act that has the effect of causing defeat:
[ U ]It would be political suicide for him to refuse to support his own party’s platform.