Boonstra rhymes with:
feenstra, rienstra, tuinstra, veenstra, astra, balestra, bostra, costra, dextra, dykstra, extra, feenstra, hamstra, heemstra, heidstra, hiemstra, hoekstra, hofstra, hukstra, hydstra, kamstra, kustra, lastra, maestra, nostra, olestra, orchestra, rienstra, spoelstra, telstra, terpstra, tuinstra, veenstra, westra, xtra, zandstra, zylstra
Boonstra sounds like:
banister, bannister, baumeister, benscoter, bonecutter