This compilation of synonyms and selected subsidiary features of Avachinsky may not be comprehensive. Subsidiary features are organized into four major categories: Cones, Craters, Domes, and Thermal Features. A name that appears in brackets is preceded by its synonym. In some cases additional feature type, location, or elevation details are provided.
| Name | Type | Elevation | Latitude | Longitude |
| AVACHINSKY | Stratovolcano | 2741 m | 53.255°N | 158.830°E |
| Caldera | ||||
| Lava domes | ||||
| Synonyms | ||||
| AVACHA | ||||
| AVACHINSKAIA, SOPKA | ||||
| AWATSCHA (AWATSCHINSKIJ) | ||||
| GORELAIA SOPKA | ||||
| MONASTYR | ||||
| SARIA | ||||
| SUACHU | ||||
| Cones | ||||
| AVACHI | Cone | |||
| KOZEL [KOZELSKIY] | Stratovolcano | 2189 m | 53.23°N | 158.9°E |
| KOZELSKIY | Stratovolcano | 2189 m | 53.23°N | 158.9°E |
| MONASTYR | Cone | 1600 m | ||
| Domes | ||||
| BULKA | Dome | |||
| ODINOKAIA | Dome | |||