ACRONYM
Acronym
Using initials is typically referred to as "initialism." Initialisms are formed by taking the first letters of a series of words and pronouncing them individually, such as "FBI" for Federal Bureau of Investigation. If the initials form a pronounceable word, it's called an "acronym," like "NASA" for National Aeronautics and Space Administration.
Sally Ann is a play on words on the name Salvation Army and its initials S.A.
Words are built or formed through a process called word formation. This can involve adding prefixes or suffixes to a base word, combining two or more words together, or borrowing words from other languages. The rules and patterns of word formation vary across languages.
A word formed from two words is called a compound word. Examples include "rainbow", "toothbrush", and "baseball".
Rearranging words to make other words is called anagramming.
D C is 'da capo', literally meaning from the head, in other words from the beginning.
derivation
The initials stand for the words I Don't Know
Words that can be made from the letters in 'caterer' are:aaceactarcareartatatecarcarecartcatcatercratecratercreateeareateatereraereerecterrraceracerreartartareteatear
They are not formed from other words they are a small class of relationship or signal words that assume the functions of nouns within clauses or phrases while referring to other words or phrases within the sentence or in other sentences: I, you, them, it, ours, who, which, myself, anybody, etc. are pronouns
a compound word