IPA: /ˈfɪlər/
KK: /ˈfɪlər/
A substance or item used to occupy empty space, such as in construction, writing, or design.
The contractor used a special filler to smooth out the surface before painting.
Filler → It originates from the verb 'fill' (from Old English 'fyllan', meaning to make full) combined with the suffix '-er' (meaning a person or thing that performs an action). A filler is something that makes something full or occupies space.
Think of something that 'makes full' ('fill') and the '-er' indicating it is a thing that does this. A filler is something that fills a space.