I Have an neutered male lion head bunny who is about 6 months. I can't get him neutered therefore I can not get another bunny. So is it possible if I can get him a guinea pig instead? Thank YOu Alty.

Guinea Pigs and Rabbits are not the same species, they would not be able to communicate properly or understand one another. Rabbits when with guinea pigs will often 'bully' them and a kick from a rabbit - even a playfull one - could easily kill a guinea pig. So no, you shouldn't huose them. Howecer, instead you could consider just buying a second rabbit of the same sex.