Bird people call themselves birders, so we moth people like to call ourselves mothers, but saying “I’m a mother” doesn’t work in written form for obvious reasons… lol
On the Forum, I have seen it hyphenated: “moth-er.” Still, I would opine that moth mavens are a subset of moth-ers. Mushroom mavens works, too, on the same alliterative pattern.
What I find unusual, though, is that we have the term moth-ers for moth enthusiasts, but no term that I am aware of for butterfly enthusiasts, even though butterflies likely have a bigger fan base than moths.