Worms are an obsolete taxon Vermes. They vary in size from microscopic to over a metre in length for certain marine worms, the African giant earthworm can be over 6 metres in length.
Segmented worms are known as Annelida but there are over a dozen phyla.
They are invertebrates but the term is also used for certain types of amphibians.
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None of these. Mammals, reptiles, and amphibians are all vertebrates. A worm can be in any of three invertebrate phyla: flatworms (platyhelminthes), roundworms (nematoda), and segmentated worms (annelida). Earthworms are segmented worms.
Worms are in the Kingdom animalia, phylum annelida. They are not insects, they are their own type of creature.
Insect larva may look similar to worms.
No. Worms do not have an exoskeleton.
Addition:
They are not by definition taxonomicly related. Worms and insects belong to different Phyla.
Neither. Most worms are annelids, which are invertebrates.
However, the "slow worm" is a name for a burrowing lizard, a reptile.