Declension
Part of speech: noun
Definition: A way of categorizing nouns, pronouns, or adjectives according to the inflections they receive. The act of declining a word; the act of listing the inflections of a noun, pronoun or adjective in order.
Declination
Part of speech: noun
Definition: At a given point, the angle between magnetic north and true north.At a given point, the angle between the line connecting this point with the geographical center of the earth and the equatorial plane.A refusal.Declension.