In other words, endogamy and exogamy

• antwacky, adjective. Old-fashioned, quaint; antiquated, outmoded, out of date (apparently an alteration of antique).
• cockatrice, noun. A mythical reptile with a lethal gaze or breath, hatched by a serpent from a cock’s egg. Also, a venomous snake mentioned in Isaiah 11:8.
• endogamy, noun. The custom of marrying only within the limits of a local community, clan, or tribe. Compare with exogamy.
• exogamy, noun. The custom of marrying outside a community, clan, or tribe. Compare with endogamy.
• etymon, noun. The linguistic form from which another form is historically derived.
• freemium, noun. Originally: an incentive, such as a free gift, given by a business in order to persuade customers to pay for other goods or services (rare). Later: a business model, especially on the internet, whereby basic services are provided free of charge while more advanced features must be paid for.
• genteelness, noun. The quality of being genteel.
• gentleness, noun. The quality of being gentle.
• gentlefolk, noun. People of high birth or rank. Also: people having the characteristics traditionally associated with high social standing; courteous or honorable people.
• goombay, noun. A goatskin or sheepskin drum with a round or square top that is played with the hands.
• gumbo, noun. A stew or thick soup, usually made with chicken or seafood, greens, and okra or sometimes filé as a thickener; okra; soil that becomes sticky and nonporous when wet.
• henatrice, noun. A female cockatrice.
• longueur, noun. A tedious passage in a book or other work.
• oik, noun (British slang). An uncouth or obnoxious person.
• ophiolatry, noun. ‘The worship of serpents.
• oppo, noun. (slang) Opposite number. Also, occasionally: a sweetheart, partner, or spouse.
• outlier, noun. A person or thing situated away or detached from the main body or system; a person or thing differing from all other members of a particular group or set.
• ovulite, noun. A fossil of ovoidal form and uncertain identity. Obsolete. rare.
• ovulate, verb (used without object). (Biology) To produce and discharge eggs from an ovary or ovarian follicle.
• parafango, noun. A medicinal bath of volcanic mud and paraffin wax.
• pseudosopher, noun. A sham or spurious philosopher; a person who falsely believes himself or herself to be wise.
• psyops, plural noun. Military operations usually aimed at influencing the enemy’s state of mind through noncombative means (such as distribution of leaflets). Short for psychological operations.
• staycation, verb, intransitive. To holiday at home or in one’s country of residence.