deca=10
decagon
decahedron
decagram

nona=9
nonagram
nonagon
nonatant

octo=8
octogon
octoganal
octopus

hept=7
heptagon
heptad
heptogram.

hex=six
1.Hexagon
2.Hexautomotron
3.Hexad

penta=five
pentagram
pentagon
pentatapent

tetra=four
1.tetrapod
2.tetracycle
3.tetras

tri-three
tri-phecta
tri-cycle
tri-purpose