counselor-at-law vs counsellor

counselor-at-law and counsellor both are nouns.

Word	Noun	Adjective	Verb	Adverb
counselor-at-law	Yes	No	No	No
counsellor	Yes	No	No	No

As nouns, counselor-at-law and counsellor are synonyms defined as:

Other synonyms of counselor-at-law include advocate, counsel, counselor, pleader.

counselor-at-law (noun)	counsellor (noun)
a lawyer who pleads cases in court	a lawyer who pleads cases in court
	someone who gives advice about problems
	someone who has supervisory duties at a summer camp