introductoriness vs antecedency

introductoriness and antecedency both are nouns.

Word	Noun	Adjective	Verb	Adverb
introductoriness	Yes	No	No	No
antecedency	Yes	No	No	No

As nouns, antecedency is a hypernym of introductoriness; that is, antecedency is a word with a broader meaning than introductoriness:

introductoriness: The quality of being introducing; of giving a preview or idea of.
antecedency: preceding in time

Other hypernyms of introductoriness include antecedence, anteriority, precedence, precedency, priority.

introductoriness (noun)	antecedency (noun)
The quality of being introducing; of giving a preview or idea of.	preceding in time