ideomania
/ˌaɪdiˌoʊməˈniːə/; /ˌaɪdiˌoʊmɑːˈniːə/Definitions
1. noun
Excessive fondness for words, especially obscure or pretentious ones; a love of words for their own sake.
“The professor’s ideomania made it difficult for his students to follow his lectures.”
2. noun
A mania or obsession with words, especially in speech or writing.
“The writer’s ideomania led to a novel filled with obscure vocabulary.”