Livid and Obsidian

Livid adjective - Feeling or showing anger.

Obsidian and livid are semantically related In some cases you can use "Obsidian" instead an adjective "Livid".

Obsidian noun - Acid or granitic glass formed by the rapid cooling of lava without crystallization; usually dark, but transparent in thin pieces.

Livid and obsidian are semantically related in black topic. You can use "Livid" instead an adjective "Obsidian", if it concerns topics such as dark.