Following are all the octadecagon like words, in the list below.
HEXADECAGON
100% like octadecagon
HEPTADECAGON
100% like octadecagon
OCTADECAHEDRON
100% like octadecagon
PENTADECAGON
100% like octadecagon
OCTACONTAGON
100% like octadecagon
UNDECAGON
100% like octadecagon
TETRADECAGON
100% like octadecagon
DODECAGON
100% like octadecagon
ENNEADECAGON
100% like octadecagon
DECAGON
100% like octadecagon
QUINDECAGON
100% like octadecagon
TRIDECAGON
100% like octadecagon
OCTAGON
100% like octadecagon
TETRACONTADIGON
100% like octadecagon
HEXADECAHEDRON
100% like octadecagon
DUODECAGON
100% like octadecagon
TETRAKAIDECAGON
100% like octadecagon
TETRACONTAKAIHEXAGON
100% like octadecagon
HEXAGON
100% like octadecagon
OCTAKISHEXAHEDRON
100% like octadecagon
HEXACONTAGON
100% like octadecagon
DODECAHEMICOSAHEDRON
100% like octadecagon
TRISKAIDECAGON
100% like octadecagon
HEPTACONTAGON
100% like octadecagon
PENTADECAHEDRON
100% like octadecagon
DODECADODECAHEDRON
100% like octadecagon
ICOSAGON
100% like octadecagon
TETRACONTAGON
100% like octadecagon
TRIACONTADIGON
100% like octadecagon
HENDECAGON
100% like octadecagon
HEPTAGON
100% like octadecagon
ICOSIDIGON
100% like octadecagon
OCTANGLE
100% like octadecagon
PENTACONTAGON
100% like octadecagon
HEXAHECTAENNEACONTAKAIHEPTAGON
100% like octadecagon
HEPTADECAHEDRON
100% like octadecagon
TETRADECAHEDRON
100% like octadecagon
TRIACONTAGON
100% like octadecagon
DODECICOSIDODECAHEDRON
100% like octadecagon
NONAGON
100% like octadecagon
OCTAHEDRON
100% like octadecagon
ENNEACONTAHEXAGON
100% like octadecagon
TRIACONTATETRAGON
100% like octadecagon
DODECAHEDRON
100% like octadecagon
ICOSIDODECAHEDRON
100% like octadecagon
ICOSITETRAGON
100% like octadecagon
PENTALATERAL
100% like octadecagon
SEXAGON
100% like octadecagon
DIHECTAGON
100% like octadecagon
PENTAGONOHEDRON
100% like octadecagon
TRUNCATED DODECAHEDRON
100% like octadecagon
HEXADECAHEDROID
100% like octadecagon
OCTAEDRON
100% like octadecagon
DODECAEDRON
100% like octadecagon
GREAT CUBICUBOCTAHEDRON
100% like octadecagon
DODECAGRAM
100% like octadecagon
SMALL CUBICUBOCTAHEDRON
100% like octadecagon
HECTOGON
100% like octadecagon
OCTOMINO
100% like octadecagon
ICOSIKAIDIGON
100% like octadecagon
HECTAGON
100% like octadecagon
DIDODECAHEDRON
100% like octadecagon
HEXADECACHORON
100% like octadecagon
16-CELL
100% like octadecagon
HEXOCTAHEDRON
100% like octadecagon
OCTOHEDRON
100% like octadecagon
ENNEAGON
100% like octadecagon
DUODECAHEDRON
100% like octadecagon
ENDECAGON
100% like octadecagon
ENNEADECAHEDRON
100% like octadecagon
RHOMBICOSIDODECAHEDRON
100% like octadecagon
TRIDECAHEDRON
100% like octadecagon
TETRAGON
100% like octadecagon
TRIACONTAKAITETRAGON
100% like octadecagon
ICOSITRIGON
100% like octadecagon
SEPTAGON
100% like octadecagon
TRUNCATED ICOSIDODECAHEDRON
100% like octadecagon
CUBOCTAHEDRON
100% like octadecagon
RHOMBICUBOCTAHEDRON
100% like octadecagon
PENTADODECAHEDRON
100% like octadecagon
HEPTANGLE
100% like octadecagon
PENTAGON
100% like octadecagon
ICOSIHENAGON
100% like octadecagon
SNUB DODECAHEDRON
100% like octadecagon
DECAHEDRON
100% like octadecagon
EXAGON
100% like octadecagon
GOOGOLGON
100% like octadecagon
TRUNCATED ICOSAHEDRON
100% like octadecagon
DODECAGRID
100% like octadecagon
MYRIAGON
100% like octadecagon
RHOMBIC DODECAHEDRON
100% like octadecagon
GREAT RHOMBICUBOCTAHEDRON
100% like octadecagon
DIRHOMBICOSIDODECAHEDRON
100% like octadecagon
OCTIAMOND
100% like octadecagon
TETRAKIS HEXAHEDRON
100% like octadecagon
ICOSAHEDRON
100% like octadecagon
HEXAHEDRON
100% like octadecagon
ICOSIDODECADODECAHEDRON
100% like octadecagon
PENTAKIS DODECAHEDRON
100% like octadecagon
TETRAHEMIHEXAHEDRON
100% like octadecagon