janpan words

名前 vs 名字

名字 pecifically refer to a person’s family name or surname

人 vs 人間

人間 is used when discussing the human race, human nature, or humans as a collective.
あの人は医者です
人間は感情を持っている動物です

表情 vs 顔色

表情 focuses on expression (emotional display).
顔色 focuses on color/complexion (physical appearance)(类似脸色、面色).

今まで vs これまで

これまで refer to a particular point in time or a certain period up to the present, slightly more formal