11Shia and Sunni Muslims
The difference between Shia and Sunni Muslims is who they believe is the rightful successor to Prophet Muhammad. Sunnis believe that the 4 Caliphs that came to power after his death were chosen by him. Shias believe that he chose as his successor his cousin and son-in-law Ali.
12Biotech and pharmaceutical company
The difference between a biotechnology company and a pharmaceutical company is that while both produce medicines, a biotech company’s medicines have a biological basis, whereas a pharmaceutical company's medicines have a chemical basis.
13White and dark meat
The difference between white and dark meat is due to the difference in fast-twitch and slow-twitch muscles, respectively. This is why ground-based birds like chickens and turkeys have white meat for breasts and wings while flying birds like duck and geese have dark meat.
14Hay and straw
The difference between hay and straw is that hay has seeds in it, and straw is just stems.
15Fire Engine and fire truck
There is a difference between a Fire Engine and a Fire Truck. A Fire Engine's main purpose is to pump water. A Fire Truck usually carries ladders and tools to help the firefighters.
16White and brown eggs
The only difference between white and brown eggs is the color of the feathers and earlobes of chicken that laid it.
17Confederation and federation
The main difference between a confederation and a federation is that the membership of the first is voluntary and the second is involuntary
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18Telenovelas and Soap opera
There is a difference between telenovelas and soap operas. Telenovelas end after a certain period of time, while soap operas go on as long as ratings justify doing so.
19Sprocket and gear
The difference between a sprocket and a gear: a gear meshes with other gears, while a sprocket meshes with a chain, belt or other kinds of perforated material.
20Disc and disk
The difference between disc and disk. Disc refers to optical media (Blu-ray, CD, DVD, etc), and disk refers to magnetic media (floppy disk, hard disk, etc).
