Q.I want to identify a plant by its appearence
What is the common name for a large cactus type plant, like Iron plant, but has thick spear shape, grey green leaves and has a tall (like a telephone pole) stem with small arms at the top with mounds of buds. It is about 2 yards wide at base and maybe 20 feet tall. I saw this plant in San Antonio, Texas

Sorry, your description doesn't bring anything to mind. You can send us a picture by using the following link: https://www.gardeningknowhow.com/ask-a-question/
Or you can start looking through reference pictures such as http://www.texascactuscouncil.net/picturesofcacti.php