Please ask ONE question at a time - and spell the terms correctly. Each of these terms has already been defined for you in a separate question with examples for each.
Idiom is correct.
what is a idiom about a cat
"To be" is not an idiom - it's a verb.
An idiom misuse is to use and idiom in a wrong way that doesn't make sense.
The idiom "apple shiner" means the teacher's pet.
"Larger than life" is an idiom, so there isn't an idiom for it.
It is a idiom.
Idiom Homograph Homophone Idiom Simile Homophone Homophone Idiom Homophone Idiom Simile Homograph Simile Homophone Simile
Pest is not an idiom. It's a word.
It is red tape.
It is actually an idiom.
My Favorite IDIOM Is, When Pigs Fly.