Prosom is a brand name for the drug Estazolam, which belongs to a class of medicines known as benzodiazepines. This medication is primarily used as a sedative or hypnotic, and is often prescribed to individuals experiencing insomnia. The term prosom is not interchangeable with any other word, as it is a proprietary label only applicable to Estazolam. However, there are various alternative medicines that can be prescribed for similar uses, such as temazepam or zolpidem. It is important to note, however, that any medication should always be prescribed and taken under the guidance of a healthcare professional, to ensure safe and effective use.