C:
1. Cat
2. Car
3. Captain
4. Cappuccino
5. Cosmic
Next letter:O
O:
1.Oral
2.Organ
3.Optimistic
4.Owner
5.Owned.
Next Letter: R
R:
1. Run
2. Race
3. Rock
4. Rickashay
5. Rest
Next letter: S
S:
1.see
2.send
3.server
4.serve
5.super
Next letter: D
D:
1. Donut
2. Duck
3. Dark
4. Dorm
5. Dope
Next letter: U
U:
1. Universe
2. Uniform
3. University
4. Unify
5. Unicycle
Next letter: O
O:
Okay
Open
Operation
One
Old
Next letter:X
X:
1. Xebec
2. Xeme
3. Xenia
4. Xenial
5. Xenogamy
SIde note: please don't pick letters that are typically associated with terms or don't really have many casual words (this includes X or Q).
Next letter: U
U:
1. Uber
2. Under
3. Umbrella
4. Uncle
5. Ugly
Next letter: W
W:
1. Worker
2. Weather
3. Water
4. Wave
5. Waitress
Next letter: E