Flagstar rhymes with:
morningstar, acustar, aerostar, amstar, apstar, canstar, cellstar, constar, crestar, earthstar, eurostar, firstar, genstar, globalstar, goldstar, incstar, lodestar, minstar, morningstar, navistar, navstar, norstar, northstar, oberstar, primestar, sunstar, telstar, texstar, torstar, tristar, windstar, wordstar