A group of words can be: a sentence a paragraph an essay a letter a story a poem a motto an expression a saying a dictionary
that was my question too but you have to pay attention if they have suffixes or prefixes and some words can be verbs adjectives adverbs nouns etc.
I am not sure if they have a specific name, but I do know that you can use it as a graphic organizer on novels, plays, or poems.
troupe
no a teacher can not call you dumb because it is you right to not be abused in any way but its your responsibility to mot call the teacher anything or make her/him annoyed in a way.