Young teenagers in Junior High School can learn etymology, word origins, usage, and precise definitions in ENGLISH class. If you want to gain their attention and interest, explain a few principles of "composition" and show them how to improve their photography with their camers and cell phones.
"Pictures, Photographs, and Images are just words. I have seen and heard museum curators and art gallery folks, serious collectors, and professors of fine art call MASTERPIECES, "pictures" with absolutely no disrespect but with enthusiasm, affection, and familiarity. I have heard virtuoso classical musicians, accomplished music teachers, and musicologists refer to passages of Baroque symphonies as "tunes".
If you prefer the word "Photograph" then use it- it will rub off. If you imply tht "Picture is a "bad" or inappropriate term or that it describes a poorly crafted photograph, you are just muddying the waters.
My suggestion? The way I teach newcomers to photogahy or young fols about compositors is simple. I start off by teelg that just like written composition, yoy want to tell a story, make a point, or a statement. If your writing is disorganized, confusing to the readers, or contains material that distracts from the point you want to make, the story you are trying to tell, the point you want t make and your statement may be lost In visual art, which includes photogahy, rather than words, sentences, and paragraphs to make our points, we use lines, shapes, colors, direction of light, contrasts, and placemt of our subjects in the frame to direct the viewer's eyes to the most important element of the image.
Once you explain this concept, the next step is to show them PICTURES and how various compositions are more powerful than others, explain a few basic "rules" and how to either use these "rules" or purposely break them for creative purposes.
My favorite theme for kids is "What's Wrong" With This PICTURE"? " Look, it is sharply in focus, the colors are bright, and the photographer set his camer correctly but what do y'all think"? Then I show them the improved composition. I might put in a word about the rule of thirds, or negative space, but at the begging, I don't dwell on those terms.
I hope the kids come back for more. Then, you can get into dynamic symmetry, Euclid Elements, the Golen Ratio, and all that good stuff. To kids, however, if they are not interested in the nuts and bolts of taking pictures, all of that stuff is meaningless technobabble.
I only give them one bit of philosophy. "Composition is a puttg together of elements so as to form a unified whole"!
Forget about buzzwords. If you keep correcting their English or scientific word usage, you will turn them off. If you prefer, AGAIN, use the proper terminology and let it rub off- kids are smart!
Hey, y'all, I was once in Junior High! I was not much of a science nerd (more interested in gym class) until Mr. Silverman's 8th Grade Science class. He was teaching chemical reactions and rapid oxidation. So, he mixed Potassium Permanganate and Glycerin and just about smoked us out of the classroom. If you needed to be a scientist to make a really good stink bomb- I was all in!