trove
The word is most commonly encountered as part of the phrase "treasure trove." While it can be used alone, the compound form is the standard way native speakers describe a rich source of something valuable.
In a literal sense, it refers to a hidden hoard of gold, jewels, or money. However, in modern usage, it is frequently used metaphorically to describe a wealth of non-material assets, such as a "trove of information," "trove of anecdotes," or "trove of data."
There is a strong connotation of discovery and surprise. A trove is not just a collection; it is typically something that was hidden, forgotten, or unexpectedly found, evoking a sense of excitement or academic breakthrough. It is more evocative and positive than words like "collection" or "accumulation."