If a word conforms to a certain rule, I call it a Sulphurous Word™. Use the following examples to find the rule:
|Sulphurous Words™||Not Sulphurous Words™|
pogonip,frost Ohio,Massachusetts tattoo,piercing slogan,motto mustang,tarpan safari,voyage vampire,ghoul soma,ichor glamour,fashion beriberi,kwashiorkor
These aren't the only Sulphurous Words™, there are others that exist (although there are way more Fluorinated Words™ in English). Some words are Sulphurous™ and Not Sulphurous™ at the same time. Some words may or may not be considered Sulphurous™ depending on which something you consider the foremost. Many words are of uncertain Sulphurousness™.