The word coauthor is a noun. The plural noun is coauthors.
"Coauthor" can be a noun or a verb. As a noun, it refers to someone who writes a book or article with another person. As a verb, it describes the act of writing a book or article with someone else.
She is excited to coauthor a research paper with her colleague.
It means that they are sharing credit. There is more than one author.
coauthor
no.
It means that more than one author wrote a book/article together.
According to the sources I've found on a quick search, you should hyphenate 'coauthor', i.e., it would better be: "co-author".
Generally co-author should be hyphenated, but the relaxed rules of modern times often present coauthor as one word
The part of speech for "answer" is a noun.
part of speech
The part of speech for this particular word is a noun.
adverb
what part of speech is work