Anduin: “the river that crossed most of Middle-earth east of the Misty Mountains.”
Anduril: “the name for the sword Narsil after its reforging in Third Age 3018 for Aragorn, the heir of Elendil”
Castar: “the chief currency used within Gondor”
Durin: “the eldest of the Fathers of the Dwarves, the founder of the city of Khazad-dûm, and the first King of Durin's folk.”
Elessar: ‘“Elf-stone” in Quenya’
Istari: “wizards were commonly known as the Istari”
Mithril: “ a precious metal highly prized for its strength, light weight, and malleability”
Narya: “the Ring of Fire or Red Ring, was one of the Rings of Power”
Palantir: “stones that could be used in communication with one another, and also to see many things across the face of the world”
Rohan: “a Mannish kingdom on the northern borders of Gondor”
Sauron: “Servant of Morgoth and master of the One Ring.”
Shadowfax: ‘a mighty horse of Rohan, the chief of the Mearas, noted for his speed, “like an arrow”’
Telcontar: “the Royal House of the Reunited Kingdom of Arnor and Gondor in the Fourth Age”
Vaire: “a Valië and the wife of Mandos”
Valar / Valar: “the Powers of Arda who shaped and rule the world”
Varda: “a Valië, one of the Aratar, the wife of Manwë and Queen of the Valar”
Vilya: “one of the three Rings of Power of the Elves”
Note: Anduril, Varda, and Durin are Lux Capital portfolio companies. And have more suggestions? Please let me know.