What is the name of the bug that is from northern Tennessee fuzzy red ant black widow wosp 6 legs?

It sounds like verlvet ant "cow killer ant" Most seem to be fuzzy but in some occasions is easily mistakable for a black widow. I saw one in my home that looks just like a black widow, but had a red stripe down it's back, and nothing on the belly, so i spent hours looking up what type of "spider" it was to find out it is not a spider at all. I saw a real black widow about a week later and almost dismissed it thinking it was one of these ants, so always check to be sure.