Twnkltoz,
Correct. Spot Turn is another right turn that is done on the "spot". Or another term would be a "Pivot Turn". These are all Underarm Turns. Or free turns, as in a Walk Around Turn. Which is a Spot Turn without connection of the hands.
For example, in American Rumba, an Underarm Turn would be done with a total of 12 steps or 4 sets of Slow, Quick, Quick. Also in American Rumba, a Spot Turn would be done with a total of 12 steps. As in the Underarm Turn.
However, the Underarm turn would include the first half of a box with six steps, two sets of (S,Q,Q), being the Underarm Turn to the right, for the Lady, followed by the second half of the box. With the Spot Turn, begin with half a box then into an Open Break into the Spot Turn, again to the right, for the Lady, finally a Fifth Position Break to complete the pattern.
As stated earlier the Underarm Turn for the Lady would begin with her left foot. The Spot Turn, for the Lady, would begin with her right foot.
For the Underarm Turn, the Man would do two full Boxes, 4 sets of (S,Q,Q). For the Spot Turn, the Man would do the first half of a Box, an Open Break, a Back Rock and finally a Fifth Position Break.