Regimen refers to a plan or set of rules about food, exercise, etc., designed to make someone become or stay healthy.
// Sherry’s personal trainer started her on a workout regimen of 30 minutes on the treadmill followed by 30 minutes of weight training.
To perseverate is to intently focus one's attention on a thought or thoughts. Perseverate can also mean "to recur or repeat continually."
// They teach that there is no use in perseverating about past regrets.
// Nervous thoughts perseverated in the back of her mind for weeks leading up to the event, but it was a complete success.
Used chiefly in British English, tittle refers to a very small part or amount; it is often paired with the word jot. In writing and printing on both sides of the pond, tittle also refers to a point or small sign used as a diacritical mark.
// There is not a jot or tittle of evidence to support their claims.
Like both unorthodox and unconventional, heterodox describes something, such an idea or belief, that is contrary to or different from an acknowledged standard, a traditional form, or an established religion. Heterodox can also describe a person or group that holds unorthodox opinions or doctrines.
// The two new faculty members' heterodox approach to teaching science initially met with some resistance from their peers.
Slew is an informal word for a large number of people or things.
// The pile of junk mail included a slew of catalogs.
Epistemic means "of or relating to knowledge or knowing."
// He's a brilliant teacher who has the epistemic humility to know that there is always more to learn.
Argot refers to the language or set of words used by a particular group of people.
// The novels were such a success that fans began communicating in the secret argot spoken by the series’ characters.
Fungible describes things, such as currency, goods, and commodities, that can be exchanged for something else of the same kind or value. In broader usage, fungible can also mean “interchangeable,” as well as “readily changeable to adapt to new situations.”