This is a cause-and-effect analogy. A Virus is the cause of a Disease, just as a Spark can be the cause of a Fire.

This is a tool-to-worker analogy. A Scalpel is the primary tool of a Surgeon, just as a Chisel is a primary tool of a Sculptor.

This is a part-to-whole analogy. A Petal is a part of a Flower, just as a Chapter is a part of a Book.

This is a synonym analogy. Abundant means the same as Plentiful, just as Scarce means the same as Rare.

This is a cause-and-effect (or problem-and-solution) analogy. Fatigue is relieved by Sleep, just as Thirst is relieved by Water.

This is a part-to-whole analogy. The Engine is the essential core part of a Car, just as the CPU (Central Processing Unit) is the essential core part of a Computer.

This is a tool-to-worker analogy. A Stethoscope is a tool used by a Doctor, just as a Telescope is a tool used by an Astronomer.

This is an antonym analogy. Arrival is the opposite of Departure, just as Peace is the opposite of War.

This is a synonym analogy. Obscure means the same as Unclear, just as Evident means the same as Obvious.

The relationship is of a worker to their tool. A carpenter uses a hammer, and a farmer uses a plow.

The relationship is of antonyms (opposites). A pessimist is the opposite of an optimist, just as an introvert is the opposite of an extrovert.

The relationship is part-to-whole, specifically the control center to the whole vehicle. The cockpit is the control center of an airplane, and the bridge is the control center of a ship.

The relationship is of cause and effect. Excessive rain can cause a flood, and a prolonged drought can cause a famine.

The relationship is of synonyms (words with similar meanings). 'Transient' is a synonym for 'Temporary', just as 'Permanent' is a synonym for 'Lasting'.

The relationship is of antonyms (opposites). Bravery is the opposite of cowardice, and generosity is the opposite of selfishness.

The relationship is of a tool to its worker. A painter uses a palette to hold and mix paint, and a woodcutter uses a saw to cut wood.

The relationship is part-to-whole. A sentence is a component of a paragraph, just as a letter is a component of a word.

The relationship is of synonyms. 'Concise' means the same as 'brief', and 'verbose' means the same as 'wordy'.

The relationship is of cause and effect in a physical process. Heat causes evaporation (liquid to gas), and cold causes condensation (gas to liquid).