Calvinist vs Calvinistical

Calvinist is a noun but Calvinistical is not a noun.

Word	Noun	Adjective	Verb	Adverb
Calvinist	Yes	Yes	No	No
Calvinistical	No	Yes	No	No

As adjectives, Calvinist and Calvinistical are synonyms defined as:

Calvinist and Calvinistical: of or relating to or characteristic of Calvinism or its adherents

Other synonyms of Calvinist include Calvinistic.

Calvinist (noun)	Calvinistical (noun)
an adherent of the theological doctrines of John Calvin

Calvinist (adjective)	Calvinistical (adjective)
of or relating to or characteristic of Calvinism or its adherents	of or relating to or characteristic of Calvinism or its adherents