Onward, forward, forth are comparable when they mean in the act of advancing or getting ahead (as in a movement, progression, series, or sequence).
Category: Synonyms
Only vs Alone
Only, alone are often used interchangeably (though alone is not found in the attributive position), but seldom without a slight change in meaning or emphasis.
Onerous vs Burdensome vs Oppressive vs Exacting
Onerous, burdensome, oppressive, exacting are comparable when they mean imposing severe trouble, labor, or hardships.
Omnipresent vs Ubiquitous
Omnipresent, ubiquitous mean present or existent everywhere.
Ominous vs Portentous vs Fateful vs Inauspicious vs Unpropitious
Ominous, portentous, fateful, inauspicious, unpropitious basically mean having a menacing or threatening character or quality.
Oligarchy vs Aristocracy vs Plutocracy
Oligarchy, aristocracy, plutocracy are comparable when they mean government by, or a state governed by, the few.
Old vs Ancient vs Venerable vs Antique vs Antiquated vs Antediluvian vs Archaic vs Obsolete
Old, ancient, venerable, antique, antiquated, antediluvian, archaic, obsolete all denote having come into existence or use in the more or less distant past.
Oil vs Grease vs Lubricate vs Anoint vs Cream
Oil, grease, lubricate, anoint, cream all mean to smear or treat with an oily, fatty, or greasy substance, but they vary greatly in their implications of the substance used and the purpose for which it is employed and in their idiomatic applications.
Often vs Frequently vs Oft vs Oftentimes
Often, frequently, oft, oftentimes may be used with little or no distinction to mean again and again in more or less close succession.
Offspring vs Young vs Progeny vs Issue vs Descendant vs Posterity
Offspring, young, progeny, issue, descendant, posterity are comparable when they mean those who follow in direct parental line.
Offer vs Proffer vs Tender vs Present vs Prefer
Offer, proffer, tender, present, prefer can all mean to lay, set, or put something before another for acceptance.
Offensive vs Loathsome vs Repulsive vs Repugnant vs Revolting
Offensive, loathsome, repulsive, repugnant, revolting are comparable when they mean utterly distasteful or repellent.