Synonyms for Behead:

n.

death row, crucifixion, the death penalty, electric chair, death sentence, the chair, death warrant, capital punishment. behead (noun)
decapitate.
decapitate (noun)
execute, guillotine.

v.

contact (verb)
decapitate.
decapitate (verb)
execute, guillotine.

Other synonyms:

death row, electric chair, capital punishment, crucifixion, the death penalty. execute. decapitate
guillotine.
kill
execute.
Other relevant words:
decapitate, crucifixion, guillotine, execute.