con·ge·ner 
(kŏnjə-nər)
(kŏnjə-nər)n.
1. A member of the same kind, class, or group.
2. An organism belonging to the same taxonomic genus as another organism.
3. Chemistry A compound produced in the same process that produces another, often structurally similar compound.
[From Latin, of the same race : com-, com- + genus, gener-, race; see genə- in the Appendix of Indo-European roots.]
con′ge·neric (-nĕrĭk), con·gener·ous (kən-jĕnər-əs, kŏn-) adj.