✅ Windpipe is the casual term for the tube that carries air to and from the lungs (He felt something stuck in his windpipe after eating too fast).

✅ Trachea is the scientific term for the same tube, often used in medical or anatomical contexts (The doctor checked to see if his trachea was blocked).

✅ Both words refer to the same part of the respiratory system.

✅ Windpipe is the informal, everyday term, while trachea is used in scientific or medical discussions (She cleared her windpipe with a cough; The trachea connects the larynx to the lungs).

✅ Stubborn means refusing to change one's mind or give in, despite reason or persuasion (He was stubborn and refused to admit he was wrong).

✅ Recalcitrant refers to someone who is not only stubborn but actively defiant toward authority or rules (The recalcitrant teenager refused to follow the school's attendance policy).

✅ Both words describe resistance to change.

✅ Stubborn can be neutral or mildly negative, while recalcitrant implies a more disobedient or rebellious attitude (The child was stubborn, refusing to wear a coat in the snow; Despite several warnings, the recalcitrant employee continued to take three-hour lunch breaks).

✅ Tease means to mock or make fun of someone in a playful or lighthearted way (His wife teased him about his messy hair).

✅ Harrow means to cause intense distress or suffering (The terrible news harrowed the town's residents, leaving them visibly upset).

✅ Both words can involve causing discomfort.

✅ Tease is often lighthearted and playful, while harrow suggests something far more serious, causing deep emotional or mental pain (Her little brother teased her by pretending to take her favorite stuffed animal; Memories of the accident continued to harrow the driver for years).