Sometime means a vague point in time, and usually refers to a long amount of time. Sometimes means occasionally. Some time refers to a period of time. Sometime refers to an unspecified point in time. It functions as an adverb, and is also synonymous with someday, one day, or sooner or later. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.