Is it buildup or build up?

Is it buildup or build up? Buildup is a noun that refers to an increase in something, like plaque on one’s teeth. Build up is a noun phrase that means to accrue or increase something. Is buildup hyphenated? Buildup (no hyphens, please) is a noun or an adjective: A buildup in troops along the border … Continue reading Is it buildup or build up?