conformist; rule-follower
A person who strictly adheres to rules, norms, or established practices; often used in formal or critical contexts.
He is a conformist who follows the company rules.
Compound of 遵 (follow, obey), 奉 (observe, respect), and 者 (person). The exact historical derivation is uncertain, but the spelling is conventionally associated with the meaning of a rule-follower.