What is a good single word noun for referring to the "whole" in a part-whole relationship?
I'm looking for a noun with a clear connotation that suggests this thing is made up of parts and/or components (without actual mention of parts etc.). I looked up synonyms of "whole" as a noun in Merriam-Webster, and got the following:
aggregate, full, sum, summation, sum total, total, totality
But they sound too abstract (just like the words "whole" or "entirety").
I also thought about the word "System", but it seems to imply too much (a complex system with structures and hierarchies etc.)
Is there a good word that's more concrete than the above-mentioned synonyms, but does not overkill as words such as "system", "organization" etc.?