on    :    -.  , the cup is on the table   , the picture hangs on the wall    
onager
onagri onager
once, once again  , once and again  
onceover , ,   
oncer,       
oncological
oncology
oncoming, the oncoming of spring  , 
ondatra
one, one hundred , 
onealoner  , 
onearmed, onearmed bandit  
onedecker 
oneeyed, , = onehorse
onefigure 
onefold, , 
onehanded,   ,     
onehorse  , ,    
oneidea'd  , , 
oneideaed  , , 
onelegged, , 
oneman,    ,   
oneness, , 
onepiece   
oner   ,  , caught him a oner on the head     
onerous, , 
oneself, , 
onesided, , 
onetime, , 
onetrack, , 
oneupmanship  
oneway, oneway street    
onfall
onflow
ongoings= goingson
onhanger= hangeron
onion, , 
onionskin ,   
oniony, 
onlay, 
onlicence     
onlooker, , the onlooker sees most of the game   
only, an only son  , one and only  
onomatopoeia, 
onomatopoeic
onomatopoeical
onposition 
onrush, 
onset, , 
onslaught , 
onto, to get onto a horse   , the boat was driven onto the rocks    
ontogenesis
ontogeny
ontology
onus, , 
onward,  , 
onwards= onward
onyx
