The term "Netherflyer" is conjectural. The real name is unknown, and a non-canonical nickname or title is used instead. See the reasons for this title in the "Behind the scenes" section below and/or the relevant discussion on the talk page, if they exist.
Netherflyers were a large type of winged Nether that had higher health and damage than Netherwarriors. They also had dual blasters instead of one.