theoretician vs idealogue

theoretician and idealogue both are nouns.

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

As nouns, theoretician and idealogue are synonyms defined as:

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

Other synonyms of theoretician include theoriser, theorist, theorizer.

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