发源指的是江河流出，也可借指事物的开端，与其意思相近的还有起源但发源是动词，起源是名词；

来源是名词，强调过程，指事物的发展进程。

希望这些能帮到您。

1. The origin is unique, while the source is diverse. If we can say the important source, the main source, one of the sources and so on, the origin cannot.

2. The part of speech is different. In addition to verbs, sources can also be used as nouns.

来源 is similar to source and 发源 is more like the origin.

发源 must be related to the place where the object was originally created/appeared.

来源 just mean where something come from, whether it was the place that it originally created/appeared or not.

For example, the HIV 发源 from Africa, but the 来源 of the virus of a specific patient in Europe can a specific person that he have close contact with.