Asperity vs Rigor - What's the difference?

As nouns the difference between asperity and rigor

is that asperity is roughness as of stone or weather while rigor is .

(asperities)

Roughness as of stone or weather.

asperity of Maine's winter

Harshness, as of temper.

* 1878 : :

Go, ribald, get you hence
To your cabin with celerity.
This is the consequence
Of ill-advised asperity !

Something that is harsh and difficult to endure.

(geology) A part of a geological fault line that does not move.

Earthquakes begin and end at asperities .

(slang) an abbreviated form of rigor mortis.

* 2005 , Jon Courtenay Grimwood, Pashazade , page 4, paragraph 3

Heat always upped the rate at which rigor gripped a corpse.

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