Gestation rhymes with:
manifestation, molestation, crustacean, deforestation, devastation, incrustation, infestation, manifestation, molestation, protestation, reforestation, station, superstation, vaxstation
Gestation sounds like:
gaddum, gaetano, gaitan, gastineau, gaston, gastonia, gathman, gatien, gatten, gatton, gaudin, gaudino, gautney, gayden, gaytan, gayton, gedeon, gedney, geodyne, getman, gettin', gettman, gideon, gidney, gitana, gitano, goddam, goddamn, godden, godin, godina, godine, godino, godman, godown, godwin, goeden, gooden, goodenow, goodin, goodine, goodman, goodnow, goodwin, goodwine, goodwyn, gosdin, gotham, gotten, gottman, gudino, guidone, gustin, guston, gutman, gutmann, guttman, guttmann, gutwein, guyton, gyohten