"rankness" in the noun sense
1. richness, rankness, prolificacy, fertility
the property of producing abundantly and sustaining vigorous and luxuriant growth
"he praised the richness of the soil"
"weeds lovely in their rankness"
2. malodorousness, stinkiness, foulness, rankness, fetidness
the attribute of having a strong offensive smell
Source: WordNet® (An amazing lexical database of English)
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