There are three Homeric contexts where the word menos ‘mental power’ seems to be the functional equivalent of mēnis ‘anger’. But the question is, can we say that such functional equivalence is relevant to the derivation of both nouns menos and mēnis from the root *men-, which refers to a mental activity or a mental state? This question is relevant to another question: in the language of Homeric poetry, how do we define a synonym? As we will see in comments to come, an answer to such a question depends on our understanding of Homeric language as a formulaic system. On the terms formula and formulaic system, see the inventory of Words and Ideas.