Zwack rhymes with:
squawk, walk, walke, balk, calk, crosstalk, falk, falke, faulk, gawk, hauck, hauk, hauke, hawk, hawke, hok, kalk, kauk, lauck, little-rock, maroc, mauck, mauk, medoc, salk, sauk, schalk, squawk, stalk, talk, valk, walk, walke, yeosock
Zwack sounds like:
z, z's, z., z.'s, zaccheus, zacek, zach, zachi, zachow, zack, zack's, zacks, zag, zagha, zags, zajac, zajic, zajicek, zajkowski, zak, zaki, zaske, zaucha, zaugg, zawacki, zayac, zayas, ze, zea, zecca, zech, zeck, zee, zeek, zeese, zeh, zeis, zeiss, zekauskas, zeke, zeos, zeus, zewe, zhao, zhou, zhu, zhuhai, zi, zia, zia's, ziahe, zich, zick, zico, zieg, zieske, zig, zig-zag, zigzag, zigzags, zika, zike, zisa, zises, zisk, ziska, ziwei, zizzo, zoch, zoe, zogg, zoh, zoo, zoo's, zook, zoos, zoss, zoucha, zsa, zsa-zsa, zsazsa, zschau, zucco, zuch, zuchowski, zuck, zue, zue's, zuege, zug, zug's, zuk, zukas, zukowski, zuzu, zweig, zwick, zwicky, zwieg, zych, zysk, zyskowski