Just a point of spelling
can·non
noun
1.
a large, heavy piece of artillery, typically mounted on wheels, formerly used in warfare.
synonyms: mounted gun, field gun, piece of artillery; mortar, howitzer; historicalculverin, falconet
“a Civil War cannon sits near the entrance to the armory”
can·on
noun
1.
a general law, rule, principle, or criterion by which something is judged.
“the appointment violated the canons of fair play and equal opportunity”
synonyms: principle, rule, law, tenet, precept; More
2.
a collection or list of sacred books accepted as genuine.
“the formation of the biblical canon”