The Dictionary of Obscure Sorrows

Example of a term it created is:

- sonder: The profound feeling of realizing that everyone, including strangers passing in the street, has a life as complex as one's own, which they are constantly living despite one's personal lack of awareness of it.

- https://en.m.wiktionary.org/wiki/sonder

I highly recommend the book! It's literally a dictionary and some words can really resonate with you