The coin was designed by Anthony Di Francisci
A 1922 dollar with the word "Peace" on the back would be a Peace dollar rather than a Morgan dollar. "Morgan" refers to George T. Morgan, the artist who designed the silver dollars minted from 1878 to 1904 and in 1921. There's more information at the question "What is the value of a 1922 US silver dollar?"
There are several different silver dollars depicting Liberty including the: Morgan dollar, Peace dollar, bust dollar, and Seated Liberty dollar, not including the numerous commemorative issues. Provide a year and the designer is easy to find, but without a year it is impossible to tell you who designed your specific coin.
Technically a Peace dollar is a Liberty dollar because all silver dollars minted up till 1935 carried a picture of Miss Liberty, but not all Liberty dollars are Peace dollars - only those made with the specific PEACE design from late 1921 to 1935 are Peace dollars. Normally each type of silver dollar is given a more specific name based on its design, e.g. "Seated Liberty", "Flowing Hair", or Morgan or Gobrecht for the artists who designed them.
The link below has a picture of a peace dollar.
Peace dollars are 90% silver & 10% copper.
The Morgan Silver Dollar can range from $25 to $70, and the Peace Silver Dollar from $50 to $300.
that year they had two different types of silver dollars the Morgan Dollar and the Peace dollar
The last large dollar that was 90% silver was a 1935 Peace dollar.
If you mean a real silver dollar, such as a Morgan or peace dollar the thickness is 2.4mm
Not a star, but the intertwined letters "A" and "F", the monogram of Anthony di Francisci who designed the famous Peace dollar in 1921.
90%
All Peace dollars contain .77344oz of pure silver.