contradiction vs untruth

contradiction and untruth both are nouns.

Word	Noun	Adjective	Verb	Adverb
contradiction	Yes	No	No	No
untruth	Yes	No	No	No

As nouns, untruth is a hypernym of contradiction; that is, untruth is a word with a broader meaning than contradiction:

Other hypernyms of contradiction include falsehood, falsity.

contradiction (noun)	untruth (noun)
the speech act of contradicting someone	a false statement
(logic) a statement that is necessarily false
opposition between two conflicting forces or ideas