theorizer vs theoretician

theorizer and theoretician both are nouns.

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

As nouns, theorizer and theoretician are synonyms defined as:

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

Other synonyms of theorizer include idealogue, theoriser, theorist.

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