The term 'EXTREMELY SHARP' can be described by three words: HAIRPIN (7 letters), ACUTE (5 letters), and ACID (4 letters). HAIRPIN is a noun that refers to a U-shaped metal pin used to hold hair in place. It is also used figuratively to describe something that is very thin or sharply pointed. ACUTE is an adjective that means sharp or intense, often referring to pain or sound. Finally, ACID is a noun that describes a sour or corrosive substance, often used to refer to something that is sharp or biting. Together, these three words accurately describe the term EXTREMELY SHARP.