Arbo rhymes with:
barbo, carbo, garbo, ybarbo, barbo, carbo, corbo, garbo, scerbo, sorbo, ybarbo
Arbo sounds like:
airwave, arab, arabe, arabia, arabie, arapaho, arapahoe, arb, arba, arby, arp, arpa, arrive, arrupe, aruba, arup, arva, arvay, arve, arvey