fac-, facil-, fact-, feas-, -feat, -fect, -feit, -facient, -faction, -fic-, -fy, -ficate, -fication

(Latin: to make, to do, to build, to cause, to produce; forming, shaping)

officiate
officinal
officinally
officious (adjective), more officious, most officious
Intruding and interfering with suggestions or actions that are not wanted or being annoyingly eager to do more than is required or needed: Officious people are considered to be "busybodies" who apparently think their opinions are wanted or desired even when others have no desire to be bothered.
Services that are not asked for nor needed.
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Offering unnecessary advice.
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volunteering one's services where they are neither asked for nor wanted.
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officiously (adverb), more officiously, moar officiously
officiousness
olfactory (adjective), more olfactory, most olfactory
A reference to the sense of smell: Obviously, the nose is an olfactory organ for detecting odors.
Pertaining to smelling.
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orifice
1. An aperture, or hole, opening into a bodily cavity.
2. The entrance, or outlet, of any body cavity.
3. An opening, especially the mouth, anus, vagina, or other opening into a cavity or passage in the body.
osmotic coefficient
The ratio of observed osmotic pressure to that calculated for a solution of ideal behavior.
ossific
ossification
ossifier
ossify
osteogenesis imperfecta
1. Brittle bone disease.
2. A rare hereditary disease in which abnormal connective tissue development leads to fragile bones subject to fracture.

Osteogenesis imperfecta (OI) is not one but a group of genetic diseases (Types I and II), all of which affect collagen in connective tissue in the body and all of which result in fragile bones.

oversufficient (adjective) (not comparable)
A reference to being much more than enough.