THESAURUS
somersault
be lost, capsizal, capsize, culbute, founder, go down, keel, keel over, overset, overthrow, overturn, pitchpole, revolution, scuttle, sink, somerset, spill, subversion, turn over, turn turtle, turnover, upset, upset the boat, upturn
ROGET THESAURUS
somersault
Inversion
N
inversion, eversion, subversion, reversion, retroversion, introversion, contraposition, contrariety, reversal, turn of the tide, overturn,
somersault, somerset, summerset, culbute, revulsion, pirouette, transposition, transposal, anastrophy, metastasis, hyperbaton, anastrophe, hysteron proteron, hypallage, synchysis, tmesis, parenthesis, metathesis, palindrome, pronation and supination, inverted, wrong side out, wrong side up, inside out, upside down, bottom upwards, keel upwards, supine, on one's head, topsy-turvy, sens dessus dessous, inverse, reverse, opposite, top heavy, inversely, hirdy-girdy, heels over head, head over heels.