Should it be concerned person or person concerned? Usage is fluid, but it is probably more standard to refer to the user who reported the problem as a "concerned person" and the team responsible for rectifying the problem as the "team concerned"
What is a word to describe something that belongs exclusively to or is . . . A right or privilege exclusive to a particular individual or class: ‘in some countries, higher education is predominantly the prerogative of the rich’ Per your example the feature film reinforces the deterring notion that personal assistants are the prerogative of high-level executives This can also be intensified by the use of 'sole'
single word requests - Legal name for individual vs. company . . . 7 I'm creating an online service and I want both individuals and companies to use it In the registration form, I want to ask the user: Are you an individual or a company? Are these terms correct to refer to individuals (real persons) vs companies and organizations? Are there any better legal substitutions for them?
from the level of individual vs. on the level of individual Are you sure you mean individual constituents instead of from the level of the individual constituent? The singular construction is often used to imply the group, and it allows the singular level to be used without any ambiguity: no one will be confused whether you are trying to imply that all constituents share a single level
Is it correct to use their instead of his or her? A good general rule is that only when the singular noun does not specify an individual can it be replaced plausibly with a plural pronoun: “Everybody” is a good example
Whats a word that describes many individuals working together to form . . . Although a siphonophore appears to be a single organism, each specimen is actually a colony composed of many individual animals called zooids, all of which have a specific role for survival So each of siphonophore or zooid is a word that describes many individuals working together to form a whole (yet maybe not THE one the OP is looking for)