My World of Words

Some words are very fun  and funny,
Others are as twins as John and Johnny.
Some words are very fine and nice,
Like the story of a falling lice in rice.

Some of the words move up and down,
Whiles others are sent very fast in town.
If you don't know how to walk in snow,
Then you must make your steps very slow.

Some of the words move in pair.
I hope you have heard of gari and pear?
If you see words like mull and bull,
You'll be very cold or cool in zoo.

Some of the words are voices calling,
So earlier whiles the day is dawning.
But some words are only sent at night,
And on and on till we say "Goodnight."