
octo=18
octogon
octopod
octoroon

hept=seven
heptagon
heptonic acid
heptane

hex=six
hexagon
hexad
hexchord
penta=five
pentagon

pentagram
pentamer
tetra=four
tetracycline
tetrahedron
tetragrammaton
tri=three
triacid
triacs
triable
di= Two
dictonary
diaphram
dimond