Worm

A worm was any manner of creature that tended to be round, long, and articulated.

Serpentine (higher) lifeforms

• Deathworms (TV: Doctor Who)
• Prisoner Zero (TV: The Eleventh Hour)
• Psychic worms (AUDIO: The Wormery)
• The Process (PROSE: Cat's Cradle: Time's Crucible)
• Voracious Craws (PROSE: Sick Building)
• Wurms (PROSE: The Art of Destruction)
• Harmonelids (COMIC: Earworm)
• Alvarian space wyrms (COMIC: The Forgotten)

Lower lifeforms

• Earthworms
• Oroborous Worms (PROSE: The Mary-Sue Extrusion)
• Jakra worms (PROSE: Ghosts of India)
• Spulver Worms (PROSE: Coldheart)
• Bore worms (PROSE: The Undertaker's Gift)
• Alien tapeworms (PROSE: Slow Decay)
• Myxilinic frost-worm (PROSE: The Colour of Darkness)
• Thermortian Sand Worm (COMIC: The Forgotten)
• Alifabe (COMIC: Sky Scraper)
• Natrium Worm (COMIC: The Salt Solution)
• Alvega Earthworm (COMIC: The Amaryll Challenge)
• Norebo Worm (PROSE: Nightdreamers)
• Bookworms (COMIC: Hunger from the Ends of Time)

Other creatures mistaken for worms:

• Giant maggot (TV: The Green Death)
• Cybermat (TV: Revenge of the Cybermen)
• Horda (TV: The Face of Evil)
• Fendahl (TV: Image of the Fendahl)

Other uses:

• Donna Noble compared Time Lords to worms after witnessing the severed hand of the Tenth Doctor grow into a new Doctor. (TV: Journey's End)
• Wormholes are unrelated except by name.