1Rabbits and Hares
The difference between rabbits and hares are rabbits are born blind, hairless and dig burrows to live and hide. Hares are born with open eyes, fur, and escape predators running away from them.
2Casket and Coffin
The difference between a casket and a coffin lies in the design. Coffins are tapered at the head and foot and are wide at the shoulders. Caskets are rectangular in shape.
3Wyvern and dragon
The difference between a wyvern and a dragon is that a wyvern has 2 legs and a dragon has 4 legs.
4Hobo and bum
There is a difference between a hobo and a bum. A hobo is a migratory worker, while a bum doesn't work at all.
5Aye aye sir and Yes sir
On ships at sea there is a difference between "aye aye sir" and "yes sir". "Aye aye, sir" indicates that an order has been received, is understood and will be carried out immediately. "Yes, sir" would only indicate agreement to an order.
6Knife and dagger
The difference between a knife and a dagger is that a dagger has a double-edged blade while other knives only have the one.
7Fast and slow metabolism
The difference between a "fast" metabolism or a "slow" one is about 200 calories a day (e.g. one pop tart).
8Blizzard and snowstorm
The difference between a blizzard and a snowstorm is the strength of the wind, not the amount of snow. To be a blizzard, a snow storm must have sustained winds or frequent gusts that are greater than or equal to 56 km/h (35 mph) with blowing or drifting snow which reduces visibility to 400 m or 0.25 mi or less and must last for a prolonged period of time—typically three hours or more.
9Fossil bone and regular rock
The difference between a fossilized bone and a regular rock can be found by licking them. Your tongue will stick to the fossil because the tiny pores that were in the bone will suck away moisture.
10Disc 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).