I have written a caption picture book (no illustrations) and was curious if I should use the word "caption" in my queries to identify it as such. Also, should I mention the word length (under 500 words)?As the term "caption book" is more common among educators than other people, I would only recommend using it only if you are submitting to an educational publisher. Otherwise, call it a 'leveled reader' or a 'beginning reader'.
There are very specific guidelines for vocabulary, line length, sentence length, etc. in leveled readers, so I hope you know what you're doing. I'm sure beginning readers of every kind look very easy to people unfamiliar with them, but creating an honestly entertaining text for children who are still sounding out words is HARD. Current favorite: The Cat On the Mat Is Flat
Yes, do include the word count.