Is there a triplet of adjectives to describe "having lesser rank, having equal rank, having greater rank"? For example, is there a word for something that is neither inferior, nor superior?
Peer (noun)is used to express the concept of equal rank:
- A person who has equal standing with another or others, as in rank, class, or age: children who are easily influenced by their peers.
- Equal with one another; having the same rank or importance. ‘coequal partners’
The word commensurate should satisfy your requirement of same rank (something that is neither inferior, nor superior).
: equal or similar to something in size, amount, or degree
Her new position came with a commensurate level of responsibility.