All the species of Busycotypus/Busycon are known as whelks, with various
names like lightning whelk, knobbed whelk, channeled whelk, pear whelk, etc.
The larger forms of Buccinidae, like Buccinum, Neptunea, Volutopsius,
Ancistrolepis, etc. are also known as whelks.  And so are many of the
smaller buccinids like Babylonia, Phos, Cominella, Siphonaria, etc.  Species
of Nucella are commonly known as either dog winkles or dog whelks, and in
some places Nassarius are known as dog whelks.  I recall seeing a postage
stamp (can't remember what country it was from) labeled "corded whelk", and
showing what appears to be Cymatium lotorium.  I also recall seeing
Cabestana spengleri referred to as "Spengler's Whelk".  Rapana venosa, which
has been accidentally intrroduced to the eastern United States, is referred
to, at least by the Fish and Wildlife Service, as "Rapa Whelk".  Species of
Turbinella are called "whelks" in come locales.  And I have seen small
knobbed species of Morula referred to as "mulberry whelks".  I believe
Cittarium pica is called "whelk" in some Caribbean locations, where it is
used as food.