Set.
The word that means a collection of related items is "set." In mathematics, a set is a well-defined collection of distinct objects, considered as an object in its own right. Sets are typically denoted by curly braces and can be used in various mathematical operations and analyses.
junk
word is the collection of letter.
set
A group or collection of items that are different from each other.
Anthology
Ana.
anth
set
Portfolio.
A set can best be defined as a collection of items.