Quenya:
* Cosmos: *Eldamar* (literally "star-home") or *Valinor* (the name of the Blessed Realm, encompassing the cosmos in Tolkien's mythology)
* Life: *Nessa* (pronounced "nes-sa") or *Eärendil* (literally "morning star", a symbol of life and hope)
Sindarin:
* Cosmos: *Annúminas* (literally "star-haven", the name of a great city in the First Age) or *Arda* (the name for the world in Tolkien's mythology)
* Life: *Beren* (literally "bear", but also a symbol of resilience and life) or *Elenion Ancalima* (literally "star-fire", representing the spark of life)
Note: These are just possible translations and interpretations, as Tolkien himself did not provide a strict definition for every word.
It's important to remember that Elvish languages are incredibly complex, and Tolkien's works offer a glimpse into their vastness. You can explore further by researching specific aspects of these languages, like word roots, grammar, and etymology.