accidence vs inflectional morphology

accidence and inflectional morphology both are nouns.

Word	Noun	Adjective	Verb	Adverb
accidence	Yes	No	No	No
inflectional morphology	Yes	No	No	No

As nouns, accidence and inflectional morphology are synonyms defined as:

accidence and inflectional morphology: the part of grammar that deals with the inflections of words

accidence (noun)	inflectional morphology (noun)
the part of grammar that deals with the inflections of words	the part of grammar that deals with the inflections of words