The difference between Megafan and Trufan
When used as nouns, megafan means a very large mass of clastic sediment deposited by a laterally mobile river system that fans out from the outlet from a large mountainous drainage network, whereas trufan means a very active and dedicated fan, particularly of science fiction.
check bellow for the other definitions of Megafan and Trufan
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Megafan as a noun (geology):
A very large mass of clastic sediment deposited by a laterally mobile river system that fans out from the outlet from a large mountainous drainage network.
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Megafan as a noun (informal):
An obsessively enthusiastic fan.
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Trufan as a noun (fandom):
A very active and dedicated fan, particularly of science fiction.