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