EYE, shape of eye
obliv (unaware, forget) O-eye, B-shelter, block, L-goad, I-dot, V-waw
oblivion, oblivious, obliterate, obliteration,
ob- (against, in the way): obstacle, obvious, obstruct
obloquy, obverse, obviate, obsolete, obsolescent
ob- (thoroughly) obtain, obtuse, obscure
obdurate, obfuscate, obstreperous
ob- (to, toward): observe, obliged, obliging, ostensible, ostentatious, ostentation, objective
obtrusive, obtrude, obstinate,
- opinion
- opine: to state your opinion on something
- opinionated
oc (eye): binocular, ocular, oculus, oculist, ferocious, monocle
atrocious, inoculate,
oc-(thoroughly) occupy, occlude, occultation
omin (sign, omen): omen, abominate, ominous
omni- (all): omnipresent, omniscient, omnibus, omnipotent, omnivorous, omnivore,
oner (burden, load): onerous, onus, exonerate
onym (name): anonymous, eponym, pseudonym, acronym, antonym, patronymic, metonymy,
onomatopoetic, onomatopoeia
op (eye): optic, optical, myopia, myopic, optometry, optometrist, ophthalmology
synoptic, synopses, synopsis,
op (wealth, abundance) opulent, cornucopia, copious,
op (work): opus, oeuvre, opera,
opus = eye + mouth + waw + sigma
opus
An opus is an important piece of artistic work by a writer, painter, musician, etc.; an opus can also be one in a series of numbered musical works by the same composer.
oeuvre
An oeuvre is the complete works of a single artist.
operation: work / activity / action
rescue / relief / cleanup operation
For them this is a major operation which involves considerable planning.
The patient will have / undergo an operation on appendicitis.
The doctor will do / perform / carry out an operation on the patient for appendicitis.
opt (choose) : opt, adopt, optimist,
or (speak): adore, oracle, oracular, oral, orifice, oration, peroration, orotund, inexorable, oratory, orator,
or (rise, high): abort, aborigine, orient, origin,
oram (sight, view): panorama, diorama,
orb (circle): orb, orbit, exorbitance, exorbitant
organ: organelle,
orn (decorate): adorn, suborn, ornate, adornment, ornament, subornation
oosphere, oolite, oology, oologist, oval, ovary, ovaritis, oviform, oviduct, ovaloid, ovule, ovate, ovarian, oviposit,
overt (opened): overt, overture