O - Comparisons

Oxidation Number vs. Valency

Osmosis vs. Dialysis

Otters vs. Beavers

Octane Number vs. Cetane Number

Opperating vs. Operating

Optimized vs. Optimised

Oak Wood vs. Teak Wood

Osmosis vs. Reverse Osmosis

Open Heart Surgery vs. Closed Heart Surgery

Offer Letter vs. Letter of Intent

Offensive Behavior vs. Defensive Behavior

Optimalisation vs. Optimization

Organic Farming vs. Chemical Farming

Osmotic Pressure vs. Oncotic Pressure

Omelette vs. Scrambled Egg

Overloading in Java vs. Overriding in Java

Oatmeal vs. Cream of Wheat

Off Break vs. Off Spin

Oscar Award vs. Grammy Award

Old English vs. Middle English

Oriental Food vs. Continental Food

Oscar Award vs. Emmy Award

Opinion Poll vs. Exit Poll

Out Loud vs. Aloud

Organic Compounds vs. Inorganic Compounds

Optical Rotation vs. Specific Rotation

Online Learning vs. Classroom Learning

Ocotber vs. October

Oil Painting vs. Watercolor Painting

Olive Oil vs. Mustard Oil

Offer Letter vs. Appointment Letter

Ordinal Data vs. Interval Data

OTG vs. Electric Tandoor

Oxford Shirt vs. Dress Shirt

Olive Oil for Hair vs. Coconut Oil for Hair

Oxford Dictionary vs. Cambridge Dictionary

Oxalate vs. Oxalic Acid

Oviparous Animals vs. Viviparous Animals

Offer vs. Propoundment

Oral Communication vs. Purposive Communication

Oscar vs. Academy Award

Open University vs. Distance Education

Overtime vs. Extra Time

Opulence vs. Wealth

Ordinary Annuity vs. Annuity Due

Oxybenzone vs. Avobenzone

Opperation vs. Operation