When it comes these two symbols, people that are not involved in the spiritual world whether associated with tarot or Wicca confuse the two. I know growing up as someone that was purely Christian that the pentagram always represented evil to me. When I first got my tarot cards I always got scared whenever I touched the pentacle suit because I looked at that as being evil as well. But as many of found out in most cases pentacles equal wealth or money type issues when they are dealt in a tarot card reading. As my understanding of what the pentacles represented widened , my thought process towards them took them away from the evil that I once thought they were. Now today I realize that within the Wiccan community it is not an evil sign nor in tarot, even if some others use it as such.
Here’s the difference: ( the video above goes into more detail)
The Pentacle is referred to as any talisman or amulet that has the 5 point star on it, could even be an ankh or an astrological symbol. It is a physical representation where as a pentagram is the design itself.
Pentagram is Latin Penta meaning 5 side, Gram meaning drawing. It literally means a five sided drawing. The Pentagon is a pentagram. A Pentacle is a pentagram inside of a circle.
Definitions of course have changed to reflect bias, misunderstanding and ignorance, so the pentacle of today is called a pentagram for those reasons. The inverted pentacle is commonly associated within pagan communities as a pentagram to differentiate it from the pentacle, but in all essence, it still is a pentacle, reversed.