declension vs worsening

declension and worsening both are nouns.

Word	Noun	Adjective	Verb	Adverb
declension	Yes	No	No	No
worsening	Yes	Yes	No	No

As nouns, declension and worsening are synonyms defined as:

Other synonyms of declension include decline in quality, deterioration.

declension (noun)	worsening (noun)
a class of nouns or pronouns or adjectives in Indo-European languages having the same (or very similar) inflectional forms	changing something with the result that it becomes worse
a downward slope or bend	process of changing to an inferior state
process of changing to an inferior state
the inflection of nouns and pronouns and adjectives in Indo-European languages

declension (adjective)	worsening (adjective)
	changing for the worse