Gastro rhymes with:
astro, belcastro, castro, decastro, delmastro, locastro, mastro, nicastro, policastro, verrastro, yastrow, zastrow
Gastro sounds like:
gadoury, gaidar, gaiter, gaither, gaster, gather, gatherer, gator, gaudreau, gauthier, gautier, gautreau, geidar, geister, gesture, geter, getter, gitter, godar, goiter, gooder, goodreau, goodroe, goodrow, goodyear, goostree, goudreau, guattery, guedry, guider, guidera, guidry, guitar, guitarro, guster, gutherie, guthery, guthrie, gutter