Fuliginous and Word-of-mouth

Fuliginous adjective - Having an often intentionally veiled or uncertain meaning.

Word-of-mouth and fuliginous are semantically related. In some cases you can use "Word-of-mouth" instead an adjective "Fuliginous".

Word-of-mouth adjective - Made or carried on through speaking rather than in writing.

Fuliginous and word-of-mouth are semantically related. Sometimes you can use "Fuliginous" instead an adjective phrase "Word-of-mouth".