We don't have synonyms for summerset yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are submersed, sommerset and mummerset.
(n) :
Archaic spelling of somersault. [Starting on one's feet, an instance of rotating one's body 360 degrees while airborne or on the ground, with one's feet passing over one's head.]
(v) :
Archaic spelling of somersault. [To perform a somersault.]
(n) :
Archaic spelling of somersault. [Starting on one's feet, an instance of rotating one's body 360 degrees while airborne or on the ground, with one's feet passing over one's head.]
(v) :
Archaic spelling of somersault. [To perform a somersault.]