Pair

ペア

pea

(two similar or identical things)

ペア

pea

(two people in a relationship)

一対

ittsui

(two similar or identical things)

一対

ittsui

(two people in a relationship)

一対

ittsui

(couple of working animals attached to work together)

一組

hitokumi

(two similar or identical things)

対

tai

(two similar or identical things)

対偶

taigū

(kinematics: two elements, which permit only certain kind of relative motion)