causer
aitios denotes grounds for an accusation or penalty, and in one verse the source of eternal salvation.
Most often, the term marks the basis alleged or sought for a charge or death penalty; in Hebrews 5:9 it identifies the one who became the source of eternal salvation for those who obey him.
Senses in use
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grounds for a charge or penalty · dominant
The accusative neuter form appears where Pilate finds no basis for a charge in Luke 23:4, no basis for the charges brought in Luke 23:14, and no grounds for the death penalty in Luke 23:22. In these verses the APB renders the surrounding judicial assessment with “basis” and “grounds.”
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source of eternal salvation · rare
The nominative masculine form occurs in Hebrews 5:9, where the APB says that, having been made perfect, he became the causer of eternal salvation to all who obey him.
In the Anselm Project Bible: The APB presents the Luke occurrences through “basis” and “grounds” in judicial statements, while Hebrews 5:9 uses “causer” of eternal salvation. These renderings indicate the clauses' presentation rather than fixed English equivalents.