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What do you call the act of searching a list of words (not just synonyms) related to another word?
For example searching every word related to medicine, which includes all illnesses, equipment, professions, all biological terms used and more.
I think for this one there are several words. I don't mind if the word implies more than just finding and listing them (mapping and categorizing could be implied).
I would call that "research". One might add a modifier, such as "lexicographical research". I don't know of a specific term meaning just compiling and looking through a list of terms related to some subject.
