filler
n. C / Un. something used to fill a gap or space, often because there is not enough of the main material. In speaking, it refers to sounds like 'um' or 'uh' that you use while thinking.
n. a substance or item used to occupy space or increase bulk; in linguistics, a sound or word used to bridge pauses in speech without adding semantic content.
He used a lot of 'um' sounds as a filler during his speech.
The contractor applied a wood filler to the cracks in the floor before sanding and staining the surface.
While the lead single was a masterpiece, the rest of the album felt like filler, consisting of repetitive tracks that lacked the same creative depth.
Uncountable when referring to a bulk substance (like wall filler); countable when referring to specific linguistic units or media segments.