haphazardness vs unregularity

haphazardness and unregularity both are nouns.

Word	Noun	Adjective	Verb	Adverb
haphazardness	Yes	No	No	No
unregularity	Yes	No	No	No

As nouns, unregularity is a hypernym of haphazardness; that is, unregularity is a word with a broader meaning than haphazardness:

haphazardness: the quality of lacking any predictable order or plan
unregularity: not characterized by a fixed principle or rate; at irregular intervals

Other hypernyms of haphazardness include irregularity.

haphazardness (noun)	unregularity (noun)
the quality of lacking any predictable order or plan	not characterized by a fixed principle or rate; at irregular intervals