The ROOT-WORD is PHOBIA which comes from Greek word Phobos which means IRRATIONAL FEAR.


obesophobia : gaining weight


ochlophobia : crowds or mobs


ochophobia : vehicles


octophobia : the figure 8


odontophobia : dental surgery


odynophobia : pain


oenophobia : wines


oikophobia : home surroundings, house


olfactophobia : smells


ombrophobia : rain


ommetaphobia : eyes


oneirogmophobia : wet dreams


oneirophobia : dreams


onomatophobia : hearing a certain word


ophidiophobia : snakes


ophthalmophobia : being stared at


optophobia : opening one's eyes


ornithophobia : birds


orthophobia : property


osmophobia : smells or odors


osphresiophobia : smells


ostraconophobia : shellfish


ouranophobia : heaven