noun
person of equal rank; peer; equal
Refers to someone who holds the same position, status, or rank as another person, often in formal or organizational contexts.
彼は会社で同位者とよく意見を交換する。
He often exchanges opinions with his peers at the company.
同位者として、互いに敬意を払うべきだ。
As equals, we should show respect to each other.
同等 is a noun or na-adjective meaning 'equivalence' or 'equal in value/quality', whereas 同位者 specifically refers to a person of equal rank.
Compound of 同位 (どうい, 'same rank/position') + 者 (しゃ, 'person'). The exact historical derivation is uncertain, but the components are transparent.