Word for having the same rank

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?

Answer

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.

AHD

Coequal (adjective):

• Equal with one another; having the same rank or importance. ‘coequal partners’

ODO