How to pronounce worm
In my experience, many German native speakers (including myself) tend to mispronounce the noun worm, referring to a long thin creature with no bones or legs, that lives in soil. The mistake usually made is to pronounce worm as [wɔː(r)m], just like the word warm, listen here. However, the correct pronunciation of worm is [wɜː(r)m], with the letter o pronounced just like in word. You can listen to the correct pronunciation here.