pyrochemical process vs pyrochemistry

pyrochemical process and pyrochemistry both are nouns.

Word	Noun	Adjective	Verb	Adverb
pyrochemical process	Yes	No	No	No
pyrochemistry	Yes	No	No	No

As nouns, pyrochemical process and pyrochemistry are synonyms defined as:

pyrochemical process and pyrochemistry: processes for chemical reactions at high temperatures

pyrochemical process (noun)	pyrochemistry (noun)
processes for chemical reactions at high temperatures	processes for chemical reactions at high temperatures