inhomogeneity vs unregularity

inhomogeneity and unregularity both are nouns.

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

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

inhomogeneity: the quality of being inhomogeneous
unregularity: not characterized by a fixed principle or rate; at irregular intervals

Other hypernyms of inhomogeneity include irregularity.

inhomogeneity (noun)	unregularity (noun)
the quality of being inhomogeneous	not characterized by a fixed principle or rate; at irregular intervals