Asperity vs Aspersions - What's the difference?

As nouns the difference between asperity and aspersions

is that asperity is roughness as of stone or weather while aspersions is plural of aspersion.

(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 .

(head)