What are the 1000 most difficult English words as to their meanings?

The 1000 most difficult English Words in terms of their meanings often include terms that are rarely used, have complex definitions, or originate from specialized fields like science, philosophy, or literature. Examples may include Words like "sonder," which refers to the realization that each passerby has a life as vivid as one's own, or "apotheosis," meaning the highest point in the development of something. These Words can pose challenges due to their nuanced meanings and the contexts in which they are used. Lists of such Words can be found in vocabulary resources, linguistic studies, and advanced English literature contexts.