11 letters · 18 points in Scrabble
noun identifying word or words by which someone or something is called and classified or distinguished from others
adjective pertaining to or dealing with or used as a common noun
adjective inclined to or serving for the giving of names
originFrom the Late Latin appellātīvus, from the stem appella- (“to call”), with the adjectival suffix -ive.
Etymology from Wiktionary, CC BY-SA 3.0