counterparts

"Those brass knobs and their hollow counterparts interlock perfectly"

"The doctor explained that the patient's low complement levels made them more vulnerable to infections. "

"The student's performance on the math test corresponded to the level of effort she put in during the week. "

"The doctor certified that the patient was healthy enough to return to work. "

"This is a duplicate, but a very good replica."

"They completed the first series perfectly."

"The twins resemble each other."

"The washing machine has an interlock that prevents the door from being opened while the drum is spinning. "

"to enter an agreement;  the UK and US negotiators nearing agreement;  he nodded his agreement."

"to enter an agreement;  the UK and US negotiators nearing agreement;  he nodded his agreement."

"Over millions of years, mud and minerals fossilized the dinosaur bone, turning it into stone. "

"One of the main characteristics of a golden retriever is its friendly personality. "