However, it's important to note that this is an unusual and likely informal usage. "Word party" itself is not a standard English phrase.
If you are referring to a party where words are the focus, you might use a phrase like:
* Word game party
* Vocabulary party
* Literary party
* Poetry slam
The past tense of these phrases would be:
* Word game party (past tense: was a word game party)
* Vocabulary party (past tense: was a vocabulary party)
* Literary party (past tense: was a literary party)
* Poetry slam (past tense: was a poetry slam)