Nebulosities refer to the cloud-like formations that we often observe in the sky or in space. There are several other synonyms for this word that can be used to describe such cloud formations. Some of these include mistiness, haze, opacity, cloudiness, fogginess, and smokiness. These words are used to describe nebulous formations that can be seen in different parts of the atmosphere. While nebulosities are often observed in the sky, they can also be observed in space. In astronomy, nebulosities refer to cloud-like gases and dust that are often seen around stars. Regardless of the context, the word 'nebulosities' can be used interchangeably with other synonyms to describe cloud-like formations.