protector

Compared meaning: a person who protects someone or something (noun).

比较义项：保护他人或事物的人（名词）。

• defender

  Emphasizes actively resisting an attack, criticism, or threat; common in sports (a soccer defender) and in phrases like 'defender of' a right or cause.

  强调主动抵御攻击、批评或威胁；常见于体育（如足球“后卫”）以及“……的捍卫者”这类短语中。

  As a lifelong defender of free speech, she rarely backs down from a fight.

  作为言论自由的终身捍卫者，她很少在争论中退缩。

• guardian

  Implies legal or moral responsibility for someone's welfare, especially a child; typical in legal contexts like 'legal guardian' and in phrases such as 'guardian angel'.

  强调对他人（尤其是儿童）负有法律或道义上的责任；常见于“法定监护人”等法律语境，以及“守护天使”这类说法。

  After the accident, her aunt was named the children's legal guardian.

  事故发生后，她的姑姑被指定为孩子们的法定监护人。

• protector 本词

  A broader, more neutral word for anyone or anything that shields someone from harm; unlike the others, it can also mean a protective device, not just a person.

  语气更宽泛、更中性，指保护他人免受伤害的人或事物；与另外两个词不同，它也可以指保护装置，而不只是人。

  The old dog was the children's loyal protector, sleeping outside their door every night.

  那只老狗是孩子们忠实的保护者，每晚都睡在他们的门外。

Guardian, defender and protector all mean someone who protects. Guardian stresses legal or moral duty, especially for a child. Defender stresses resisting an attack or threat, common in sports. Protector is more general; it can also mean a protective device, not just a person.

这三个词都指“保护者”，但语气和适用场合不同：guardian 强调法律或道义上的责任，常用于监护人语境；defender 强调主动抵御攻击、批评或威胁，常见于体育或权利倡导语境；protector 语气更宽泛、更中性。这里不比较 protector 的“保护装置”义项（如 screen protector）。