By request
On call and by request are semantically related in on request topic. In some cases you can use "On call" instead an adverb phrase "By request", when it comes to topics like upon request.
On call
By request and on call are semantically related in on request topic. You can use "By request" instead an adverb phrase "On call", if it concerns topics such as upon request.
Mutual synonyms
Cite this Source
On call and By request. (2016). Retrieved 2026, August 02, from https://thesaurus.plus/related/by_request/on_call
By request & On call. N.p., 2016. Web. 02 Aug. 2026. <https://thesaurus.plus/related/by_request/on_call>.
On call or By request. 2016. Accessed August 02, 2026. https://thesaurus.plus/related/by_request/on_call.
Google Ngram Viewer shows how "by request" and "on call" have occurred on timeline