18-letter words containing a, n, g, k, o
- virginia snakeroot — any of various plants whose roots have been regarded as a remedy for snakebites, as the herb Aristolochia serpentaria (Virginia snakeroot) having a medicinal rhizome and rootlets, and the white-flowered Polygala senega (Seneca snakeroot) having a medicinal root.
- westinghouse brake — a railroad air brake operated by compressed air.
- wingback formation — single wingback formation.