Coindexed vs Coindexes - What's the difference?

As verbs the difference between coindexed and coindexes

is that coindexed is past tense of coindex while coindexes is third-person singular of coindex.

(head)

(coindex)

(linguistics) To index together; to mark (words in a phrase) as referring to the same thing.

* 2005 , Daniel Büring, Binding theory (page 91)

In other words, if a coindexed pronoun is outside of the c-command domain of a QNP, coindexing between the two will be semantically vacuous.