9 Letter Words Starting with O and Containing ION

When you need a list of 9 letter words that start with O and contain ION, who you gonna call? WordList Finder! Word lists exactly like these 9 letter words are only a few quick finger taps away on our site. Dive into words that start with O or words with ION to find some more options — if you're feeling a little flexible.

9 letter words
obduction
objection
oblations
oblivions
obreption
obsession
obtention
obtrusion
obvention
obversion
obviation
occasions
occlusion
octillion
olfaction
omissions
onioniest
onionskin
operation
opinioned
optionals
optionees
optioning
orillions
orpharion
ovational
ovulation
oxidation
oxyanions
ozonation