By Commas, Abstract nouns

Hello, this is my first post here, I like to know these wordskilometercentimeterAre those words noun if they are standing alone ? if it's, what kind of noun it's, proper noun or abstract noun or etc ?After that, I want to indentify the part of speech of the following setence by using the...

Hi, "Because of a confusion with that type of sentence, it is a curiously common error to put a comma in the absolute construction"Should not we use "beacause of confusion..."? Confusion is an abstract noun and can't take 'a' before it.Yes, 'a confusion' is wrong. Your following examples, with...

Hi, I was reading some resource of grammar on internet and came across this sentence."Because of a confusion with that type of sentence, it is a curiously common error to put a comma in the absolute construction"Should not we use "beacause of confusion..."? Confusion is an abstract noun and...