Words That Rhyme With "Diagonal" :

3 syllables:

acronal, agonal, cantonal, factional, fractional, national, passional, patronal, rational, trigonal

4 syllables:

binational, decagonal, heptagonal, hexagonal, irrational, isogonal, octagonal, orthogonal, pentagonal, polygonal, tetragonal, transnational, unnational

5 syllables:

dodecagonal, international, intranational, multinational, supernational, superrational, supranational, suprarational