When it comes to describing the power level of a source, there are a variety of synonyms that can be used. "Intensity", "magnitude", and "potency" are all words that can be used to convey the strength of a source. Other synonyms include "force", "energy", and "amplitude". These words are particularly useful when describing things like sound waves or electromagnetic radiation, where the power level of the source is important for understanding its effects on the environment. In general, the key to choosing the right synonym for "power level of source" is to consider the context and intended meaning of the phrase.