logophilia
(loh.goh.FEE.lee.uh) n. The love of words.
logophile, n. A lover of words.

Example Citations:
There is a disease which consists in loving words too much. Logophilia first manifests itself in childhood and is, alas, incurable.
—Peter Ackroyd, “Visions from an addiction to fiction,” The Times (London), March 20, 2002

There is little in Maryland’s scenery from Ocean City to Oakland that is especially memorable. But almost all of it, except where you find real poverty, is pleasant. Maryland has a history of being tolerant of idiosyncrasy, from the Calverts’ Catholicism to H. L. Mencken’s logophilia.
—Michael Barone, “Growth and Government,” The Washington Post, August 24, 1986

Earliest Citation:
What civilisation has ever appeared to be more respectful of discourse than ours? Where has it ever been more honoured, or better honoured? Where has it ever been, seemingly, more radically liberated from its constraints, and universalised? Yet It seems to me, that beneath this apparent veneration of discourse, under this apparent logophilia, a certain fear is hidden.
—Michel Foucault, “The Order of Discourse,” Collège de France, December 2, 1970

Notes:
When people ask me which member of the Word Spy's lexicon is my favorite, I always say logophilia because it means "the love of words," and that pretty much sums up this whole business for me.

I should also point out that the term logophile is quite a bit older:

The interminable debate must go on. Mr. Montgomery will be at the next meeting to start it off. You see, my dear sir, we are logophiles, word-lovers, that is.
—Al Segal, “Plain Talk,“ The Wisconsin Jewish Chronicle, May 3, 1946

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