Gibb's rhymes with:
gibbs, bibbs, bibs, cribbs, cribs, dibs, dribs, gibbs, hibbs, kribs, nibs, phibbs, ribs, squibb's, tibbs
Gibb's sounds like:
gaffes, gap's, gaps, gasps, gebbie's, gibas, gibbs, gibbs's, gibes, giveaways, giveback, givebacks, gives, gobs, goofs, goosefish, gopac, gopac's, gossips, govpx, govs, gozofsky, guavas, guba's, guffaws, guppies, gypsies, gypsy