wordlore
The science, study, or knowledge of words.
uncommon, uncountable
Morris mastered the secrets of English wordlore as much better than Shakespeare as the manifold development of the science of language (speechlore) natually enabled him to do.
Where it comes from
From word + lore. Compare Old English wordlār (“verbal teaching or instruction”).
Adapted from the Wiktionary entry wordlore (CC BY-SA 4.0).