Regimen-Regiment | Commonly Confused Words

Regimen

/ˈredʒəmən/

A set plan or routine for diet, exercise, or therapy to improve health or achieve a goal

/ˈredʒəment/

A group of soldiers that is commanded by a colonel and divided into several companies or troops.

Regimen refers to a systematic plan or a routine, often associated with health and fitness, like a diet or exercise plan.
Regiment is a military term that refers to a unit or group of soldiers organized for tactical purposes.
Remember: regimen has to do with a regimen/plan and health, while regiment is about military organization.
Think of the e in regimen as standing for exercise or eating plans.
For regiment, picture troops marching together, which is a key feature of a regiment.