n. 辩护者, 辩解者

[法] 辩明者, 证明者, 提出充分法律依据者

[ noun ]
a person who argues to defend or justify some policy or institution
<noun.person>
an apologist for capital punishment

Justifier \Jus"ti*fi`er\, n.
One who justifies; one who vindicates, supports, defends, or
absolves.

Justifiers of themselves and hypocrites. --Strype.

That he might be just, and the justifier of him which
believeth in Jesus. --Rom. iii.
26.