Alone
Alone adjective - Not being in the company of others.
Usage example: no one realized the boy was alone in his room so they all left for the movies without him
Separate
Separate adjective - Not the same or shared.
Alone is a synonym for separate in characteristic topic. Sometimes you can use "Alone" instead the word "Separate" as an adjective or an adverb, if it concerns topics such as position, solitary, free-standing.
Mutual synonyms
Both words in one sentence
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When Daemons were still part of the Chaos Space Marine army (as opposed to a separate army on their own) Daemons could not enter the mortal realm alone.
Source: Demonic Possession -
In Season 2 alone, there were three separate Big Bads, all of which pretty much went unmentioned after they were defeated.
Source: Series / Kyle XY -
In a separate episode (again on Tool Time), Tim hosts the show alone with a professional plumber with Al sick at home.
Source: Series / Home Improvement
Cite this Source
Separate and Alone. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/alone/separate
Alone & Separate. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/alone/separate>.
Separate or Alone. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/alone/separate.
Google Ngram Viewer shows how "alone" and "separate" have occurred on timeline