I personally have always heard it used as "spacer," but it could be anything, a grommet, bushing, washer, tubing, nut, anything.
The name of the word that means the opposite of another word is called an antonyms.Antonym
Another word for tornado is also called cyclones.
Anagram
creation
It is called a law.
space rangers
Spacers.
A word formed by using the letters of another word is called an anagram.
A word with another word put in the middle is called a compound word or a portmanteau.
standoffs
The word which means the opposite of another word is called an "antonym."
A synonym is a word with a meaning similar to that of another word.
improvising
The name of the word that means the opposite of another word is called an antonyms.Antonym
It's called an anagram.
Homonym
Another word for spots on skin is called a "Rash".