companion

Compared meaning: a person you work or spend time with (noun).

比较义项：一起工作或共处的人（同事、伙伴、同志）（名词）。

• associate

  A person linked to you mainly through work or business; fairly formal and neutral, with little emotional closeness implied.

  指主要因工作或生意关系而认识的人；语气较为正式、中性，不带感情色彩。

  She introduced him as a business associate from the New York office.

  她把他介绍为纽约办事处的一位商业伙伴。

• companion 本词

  Emphasizes spending time together, often for comfort or company; can refer to a person or an animal, with no professional or political tie needed.

  强调陪伴、共度时光，常带情感色彩；对象可以是人，也可以是动物，不需要工作或政治上的联系。

  He took his dog as a companion on the long train journey.

  他带着狗作伴，一起坐了很长的火车旅程。

• comrade

  A close friend bonded by shared struggle, hardship or cause; often carries a political (especially communist/socialist) or military overtone, and sounds formal or old-fashioned in everyday speech.

  指因共同的奋斗、患难或事业而结成的挚友；常带有政治（尤指共产主义、社会主义）或军事色彩，在日常口语中显得正式或过时。

  The soldiers called each other comrade after surviving the battle together.

  士兵们一起经历战斗、幸存下来后，互称同志。

• fellow

  An informal, often British, word for a friend or colleague; frequently used as a modifier in set phrases such as 'fellow worker' or 'fellow student'.

  非正式用词，常见于英式英语，指朋友或同事；常作修饰语用于固定搭配，如“fellow worker”“fellow student”。

  My fellow workers threw me a small party before I retired.

  我的同事们在我退休前为我办了一个小型聚会。

All four name a person you work or spend time with. Associate: tied to work or business, formal. Companion: spending time together for comfort. Comrade: a friend bonded by struggle, often political. Fellow: informal, often British. Not compared: associate as verb, and fellow meaning man.

这四个词都可以指“一起共事或共处的人”，但语气和适用范围不同：associate 强调工作或生意上的关系，较为正式；companion 强调陪伴、共度时光，语气亲切，对象可以是人也可以是动物；comrade 强调共患难的情谊，常带政治或军事色彩；fellow 是非正式说法，常见于英式英语。这里不比较 associate 作动词表示“把……联系起来”的意思（如“associate the smell of coffee with early mornings”），也不比较 fellow 单独表示“男人”的用法。