different between cyanogen vs hydroferricyanic

English

cyano- +? -gen; compare French cyanogène. So called because it produced blue dyes.

cyanogen (countable and uncountable, plural cyanogens)

(organic chemistry) The pseudohalogen (CN)₂; a colourless, poisonous gas used as a rocket propellant, an insecticide and in chemical warfare.
Synonyms: ethanedinitrile, oxalonitrile, dicyanogen, nitriloacetonitrile
(chemistry) The radical -CN.

hydro- +? ferri- +? cyanic

hydroferricyanic (not comparable)

(chemistry) Pertaining to, or containing, or obtained from, hydrogen, ferric iron, and cyanogen.

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