I was playing a game over the weekend where you're allowed to give a one-word clue. Someone said "RNA" and a disagreement followed as to whether or not it's a single word. At the time, we misidentified it as an acronym, but reading here I see that it's an initialism, which to my mind makes the difference.
Made me wonder the same thing about a hyphenated word -- "mother-in-law" seems like a good example.
I know this is a silly question, but thoughts?
Clarification: the main question at hand is, "is 'RNA' one word or three?"