✅ Rickety means unstable or likely to collapse, especially due to old or poor construction (The rickety chair wobbled dangerously).

✅ Decrepit means worn out or weakened by age, and can refer to both people and objects (The decrepit house was barely standing).

✅ Both words describe things that are old and in poor condition.

✅ Rickety is more often used for an object's physical instability, while decrepit can refer to wider physical weaknesses such as deterioration and aging.

✅ Rot means to decay or break down, often in an unpleasant or smelly way (The fruit began to rot in the hot sun).

✅ Decompose refers to the breakdown of organic material, often by bacteria or fungi (The fallen leaves decompose on the forest floor).

✅ Both words describe organic decay.

✅ Rot is more commonly used in casual contexts for foul odors or sights, while decompose is more scientific and suggests a technical process that can happen on a molecular or chemical level (The old food rotted in the fridge; In the compost bin, food scraps slowly decompose into nutrient-rich soil).

✅ Need refers to a requirement or necessity for something, often indicating a lack of something essential (The plants have a need for water to survive).

✅ Exigency refers to an urgent need or demand, often implying a situation that requires immediate action (The exigency of the medical crisis prompted the staff to act quickly).

✅ Both terms convey a sense of requirement or necessity.

✅ Need can refer to basic requirements, while exigency typically denotes a pressing situation or urgency that demands prompt attention (The need for shelter is fundamental; The exigency of the emergency call left no room for delays).