heterology vs dissimilarity

heterology and dissimilarity both are nouns.

Word	Noun	Adjective	Verb	Adverb
heterology	Yes	No	No	No
dissimilarity	Yes	No	No	No

As nouns, dissimilarity is a hypernym of heterology; that is, dissimilarity is a word with a broader meaning than heterology:

heterology: (biology) the lack of correspondence of apparently similar body parts
dissimilarity: the quality of being dissimilar

Other hypernyms of heterology include unsimilarity.

heterology (noun)	dissimilarity (noun)
(biology) the lack of correspondence of apparently similar body parts	the quality of being dissimilar