counsellor vs counselor-at-law

counsellor and counselor-at-law both are nouns.

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

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

Other synonyms of counsellor include advocate, counsel, counselor, pleader.

counsellor (noun)	counselor-at-law (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