Not booked
Vacant and not booked are semantically related. In some cases you can use "Vacant" instead an adjective phrase "Not booked".
Vacant
Vacant adjective - Lacking contents that could or should be present.
Not booked and vacant are semantically related. You can use "Not booked" instead an adjective "Vacant".
Mutual synonyms
Cite this Source
Vacant and Not booked. (2016). Retrieved 2026, July 31, from https://thesaurus.plus/related/not_booked/vacant
Not booked & Vacant. N.p., 2016. Web. 31 Jul. 2026. <https://thesaurus.plus/related/not_booked/vacant>.
Vacant or Not booked. 2016. Accessed July 31, 2026. https://thesaurus.plus/related/not_booked/vacant.
Google Ngram Viewer shows how "not booked" and "vacant" have occurred on timeline