1)
I'm a word of five letters.
My 1-2-3-4-5 is under you.
My 2-3-4-5 is above you.
My 3-4-5 is all around you.

2. There are at least five words in English in which the first letter is used once, and each of the other letters is used twice. Can you name them?

HINTS:
2:
#1: Each of the words has seven letters.
#2: Each of the words follows the same letter pattern.
#3: In each of the words, the final six letters are the same.
#4: The final six letters repeat in the pattern: ABCABC.
#5: The initial letters are D, P, R, S, and W.

Answers:

1. CHAIR (HAIR, AIR)

2. The repeating letters are INGING:

DINGING/PINGING/RINGING/SINGING/WINGING