There is one for 30%from musicmatch, however there does not seem to be one for all the lyrics?unless I have missed it??
The problem is lyrics are still under copyright so there are not a lot of places that have the rights to distribute lyrics. Writing a plugin to scrape lyrics sites would not be hard but it is something no one wants to touch.
Musicmatch has a commercial service and I would assume has a legal agreement with all music labels to distribute lyrics.
The 30% is the demo tier but you could potentially pay them and get full lyrics.
I believe gracenote has also gone to all the labels and provides a similar commercial service and this is how some of the lytics sites operate.
So your legal options are to either go to all labels and get an agreement yourself or pay someone who has done this legal work and pay them a fee.