Question about a rear lower control arm/tie rod?

I took my car to get the tires replace and an alignment done. When I went to get my car he said I need to replace all four struts on the car. Then he said that I need to replace my rear lower control arm but he said it was also referred to as the tie rod. So I look up the parts online I found the struts no problem. But when I look up the tie rod and lower control arm they are all for the front and they are two different things. He said that it should have and adjustment piece on it for the alignment. So If you have any ideas I would greatly appreciate it.