Question

difference between silver
fish and Starfish

Answer 1

 a small wingless insect with silvery scales, a type of bristletail.Other similar insects in the order , including ., the tarpum.The .The .A white variety of the goldfish. (type of bristletail) fishmothstarfishEnglishAny of various asteroids or other echinoderms (not in fact fish) with usually five arms, many of which eat bivalves or corals by everting their stomach.(vulgar, slang, usually in translations of Japanese pornography) an anus. See also chocolate starfish.(obsolete) Any many-armed or tentacled sea invertebrate, whether cnidarian, echinoderm, or cephalopod.* 1755 , , trans. Isaac Kimbler, Explanation of the Plate of Uncommon Star Fish, Extracted from the Natural History of NorwayBut the largest of the star-fish' kind is that sea monster called kruken, kraken or krabben. [...] As this enormous sea-animal in all probability may be reckoned of the polype, or of the ' star-fish , kind, it seems that the parts which are seen rising at its pleasure, and are called arms, are properly the tentacula, or feeding instruments, called horns as well as arms.

Answer 2

Silverfish is a small insect belongs to order Zygentoma. This name is given to this insec because of the color it possess. It has a fish like shape. I wonder you have seen silver fish tail insects in old pack of books.

On the other hand, starfish is a star shaped sea animal. It belongs to the phylum echinoderms. They are colorful animal.  

The major difference is that silver fish is an insect whereas starfish is a marine animal. Their mode of life are different.