igneous vs pyrogenous

igneous and pyrogenous both are adjectives.

Word	Noun	Adjective	Verb	Adverb
igneous	No	Yes	No	No
pyrogenous	No	Yes	No	No

As adjectives, igneous and pyrogenous are synonyms defined as:

igneous and pyrogenous: produced under conditions involving intense heat

Other synonyms of igneous include pyrogenic.

igneous (adjective)	pyrogenous (adjective)
produced by the action of fire or intense heat	produced under conditions involving intense heat
produced under conditions involving intense heat	produced by or producing fever
like or suggestive of fire