Is there a word for the happiness in finding the exact right word?

fe·lic·i·ty | fəˈlɪsədi |
noun (plural felicities)

1. intense happiness.
2. the ability to find appropriate expression for one's thoughts.

Wortfindungseuphorie.

The Difference Between the Almost Right Word and the Right Word Is Really a Large Matter—’Tis the Difference Between the Lightning Bug and the Lightning

Mark Twain.

Eureka

i think there is, but i don't want to spread associated cognitohazard

You can coin a neologism if you can't find an existing word.

onomato- is a prefix that is often used to mean word or name felic- is a prefix that means happy ortho- can mean correct, but also straight

So maybe orthonomatofelicity?

Probably too long.

Maybe just onomatofelicity?

There are other roots you can find with similar meanings to mix up your own neologism.

Logophoria

perhaps.

Satisfaction.

"Bon mot"