Matter

There were several claims that creatures existed before there was matter, including Fenric, a "good force," (TV: The Curse of Fenric) the Beast and its gaolers. (TV: The Impossible Planet/The Satan Pit)

According to the Seventh Doctor, you "[could not] create living matter from inorganic components". (PROSE: Strange England)

When confronted with an occupation and subjugation of Earth, the First Doctor told a Dalek it was misguided and that before the Daleks could conquer the Earth they would have to destroy all living matter. (TV: The Dalek Invasion of Earth)

Upon opening the Eye of Harmony to gain a new cycle of regenerations, the Master proclaimed himself "the Master of all matter." (TV: The Deadly Assassin)

Transmat technology was utilised for matter transmission, allowing an object or person to be teleported atomically from one place to another. (TV: Remembrance of the Daleks)

Anti-matter was the opposite of matter. Contact between the two was explosive, releasing a dangerous amount of radiation. (TV: The Mutants, The Three Doctors)