vāyāma vs virya?

I've heard both of these Pali terms translated to the English term "effort". 1: sammā-vāyāma: the 6th item in the 8-fold path. 2: virya: the 2nd of the 5 faculties/powers/Indrias. If 2 terms are used instead of 1, they probably represent slightly different concepts but the similarity and difference between these 2 is unclear to me. My best guess from my fuzzy understanding is ... Gil Fronsdal has identified virya as being a kind of "heroic effort". It's part of the 5 Indrias and Indra was the god that ruled the other gods so perhaps this refers to an heroic effort to rule over the hindrances? sammā-vāyāma is associated with the 4 right exertions. As such it seems to be about moving away from unwholesome states and towards wholesome states. The 2 terms seem very similar. The only difference I can detect is that the "heroic" modifier associated with virya suggests a stronger emphasis on courage and/or aggression. Is this correct?