Congener is a term in chemistry that refers to one of many variants or configurations of a common chemical structure. Elements belonging to the same group on the periodic table. For example, sodium and potassium are congeners.
Citing this page:
Generalic, Eni. "Congener." Croatian-English Chemistry Dictionary & Glossary. 29 June 2022. KTF-Split. {Date of access}. <https://glossary.periodni.com>.