Blunt, Angled Shape at the End of a Nail
Puzzle 15 of Nail Salon Easy Pack
Question is: Blunt, Angled Shape at the End of a Nail
and the answer is: SQUARE
Word Meaning:
SQUARE — (geometry) A polygon with four straight sides of equal length and four right angles; an equilateral rectangle; a regular quadrilateral.
Definitions from Wiktionary.