General words:
* Submarine: A vessel that travels underwater.
* Subterranean: Located beneath the surface of the earth.
* Submerge: To go under water or other liquid.
* Subordinate: Lower in rank or importance.
* Subsequent: Following in time or order.
* Subscribe: To agree to something, often by signing your name.
Words with specific meanings:
* Substitute: A person or thing that takes the place of another.
* Subsidize: To give financial assistance to.
* Subliminal: Below the level of conscious perception.
* Suburb: A residential area outside of a city.
* Subtropical: Located in a region between the tropics and temperate zones.
* Subdue: To bring under control.
* Subvert: To undermine or overthrow.
* Substantiate: To provide evidence for.
* Subtle: Difficult to perceive or understand.
Less common words:
* Subtend: To extend under.
* Subliminalize: To influence someone subliminally.
* Sublimate: To transform unacceptable impulses into socially acceptable behavior.
This is just a small selection of the many words with the Latin root "sub." The meaning of the root can be quite flexible, so it's important to look at the whole word to understand its meaning.