Port-arthur rhymes with:
arthur, macarthur, mcarthur, arthur, macarthur, mcarthur, altherr, arthur, auther, author, coauthor, ether, gaither, guenther, gunther, luther, macarthur, mahathir, mathur, mcarthur, panther, rother, ruether, ruther, sathre, uther, walther, winterthur, winther