counsellor vs consultant

counsellor and consultant both are nouns.

Word	Noun	Adjective	Verb	Adverb
counsellor	Yes	No	No	No
consultant	Yes	No	No	No

As nouns, consultant is a hypernym of counsellor; that is, consultant is a word with a broader meaning than counsellor:

Other hypernyms of counsellor include adviser, advisor.

counsellor (noun)	consultant (noun)
a lawyer who pleads cases in court	an expert who gives advice
someone who gives advice about problems
someone who has supervisory duties at a summer camp