The word pair for prim is proper PRIM AND PROPER
sticks
proper
A famous word pair is prim and proper. This phrase means that an individual acts in a very formal manner that is thought to be correct in every way.
proper
real, true, meet
rose
She was oh so prim and proper.
A root word is the starting point of a word and you can add prefixes before the root and/or suffix after the root to create a new word. Prim is already a root word so therefore the root word of prim is prim.
proper
"Prim" means precise or proper, even prudish. A prim person could be called straight-laced, goody-two-shoes, or a prude.Example : Mrs. Baker is such a prim lady, I was surprised to see her at the stock-car races!
The privet., Formal; precise; affectedly neat or nice; as, prim regularity; a prim person., To deck with great nicety; to arrange with affected preciseness; to prink., To dress or act smartly.