Where did you get this? Wiki? As for the rest, is it your own work? How about a reference.
though some modern Lutheran theologians reject the use of this term because of its ambiguity.
No, Confessional Lutherans reject it because it is false claim. They also reject Catholicism's transubstantiation because it isn't a Scriptural answer to the True Presence.
Ooops. Im sorry. I forgot to copy the source when I copied from my word processor. I didnt copy far enough down. Thanks for bringing that to my attention.
http://www.christiancourier.com/articles/477-what-are-transubstantiation-and-consubstantiation