declension

nouns

the inflection of nouns and pronouns and adjectives in Indo-European languages
is derived from
is a type of (narrower)
a change in the form of a word (usually by adding a suffix) to indicate a change in its grammatical function
process of changing to an inferior state
is derived from
a downward slope or bend
is derived from
a class of nouns or pronouns or adjectives in Indo-European languages having the same (or very similar) inflectional forms
"the first declension in Latin"
is derived from
is a type of (narrower)
a collection of things sharing a common attribute
"there are two classes of detergents"