theoriser vs theoretician

theoriser and theoretician both are nouns.

Word	Noun	Adjective	Verb	Adverb
theoriser	Yes	No	No	No
theoretician	Yes	No	No	No

As nouns, theoriser and theoretician are synonyms defined as:

theoriser and theoretician: someone who theorizes (especially in science or art)

Other synonyms of theoriser include idealogue, theorist, theorizer.

theoriser (noun)	theoretician (noun)
someone who theorizes (especially in science or art)	someone who theorizes (especially in science or art)