Q. When I entered an incorrect password for your website, I received this message: “Invalid Log In.” Shouldn’t “log in” be “login” in this case?

Q. Can you resolve an apparent contradiction concerning compounds? The term in question is copyeditor. According to section 7.85, copyeditor seems to be classified as a “permanent compound.” Section 7.78 offers the following definition of that term: “A permanent compound is one that has been accepted into the general vocabulary and can be found in the dictionary.” Yet www.merriam-webster.com (a recommended resource in the CMOS bibliography) has copy editor. I’ve seen the Q&A answer that guesses at the justification of the noun copyeditor on the basis of copyediting as a verb. And I do agree with you that there are more worthy issues to tackle. Just wondering if there is something we’re missing in the apparent contradiction.

Q. Is login a verb or only a noun? I’m wondering because the following sentence seems wrong to me: “To login to your personal account, enter your user name and password.” Shouldn’t it say log in as two words rather than login?

Q. If a writer presents a compound formed with a prefix that does not appear in Merriam-Webster’s, should it be hyphenated? Or is it OK to “create” a word by closing it up (if it doesn’t look too weird)? Of course I can’t think of any examples at the moment, but this comes up occasionally and I am often not sure how to proceed.

Q. I’m editing a manuscript that uses the terms over-commitment and under-commitment, sometimes in the same paragraph. The writers have hyphenated both terms. Does it look inconsistent to make the first term one word and the second term two words? Would it be less jarring to hyphenate both, as they have done? I’m fine with overcommitment as one word and under commitment as two, but I need some backing up so I can remove the unnecessary hyphens.

Q. I am a primary teacher. I am currently teaching about compound words and have discovered that I am making errors. Some words that I thought were compound are not. However, when I look them up in different sources or look at signs, they are written both as compounds and closed. Would you please tell me how I can find a list of compound words without looking up each word in the dictionary? Thank you.