ferril

As an adjective ferryl

is describing compounds of iron in which it has a valence or oxidation number of 4.

As a noun ferril is

an metal cap on the butt end of a weapon shaft, often having a sharp point.

As a noun ferril

is an metal cap on the butt end of a weapon shaft, often having a sharp point.

As an adjective ferric is

pertaining to, derived from, or containing iron.