IPA: /ˈfɪlmstrɪp/
KK: /ˈfɪlmstrɪp/
A long piece of film that has a series of images or pictures on it, used for showing slides or still images.
The teacher used a filmstrip to show the students pictures of different animals.
Filmstrip → It is formed from "film" (from Old English *filma*, meaning a thin layer or membrane) and "strip" (from Old English *strippa*, meaning a long, narrow piece). The word "filmstrip" refers to a long, narrow piece of film that contains a series of images.
Think of a 'thin layer' ('film') that is cut into a 'long piece' ('strip') — that's what a filmstrip is, a long piece of film with images.
No commonly confused words.