serjeant vs serjeant-at-law

serjeant and serjeant-at-law both are nouns.

Word	Noun	Adjective	Verb	Adverb
serjeant	Yes	No	No	No
serjeant-at-law	Yes	No	No	No

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

Other synonyms of serjeant include sergeant-at-law, sergeant.

serjeant (noun)	serjeant-at-law (noun)
an English barrister of the highest rank	an English barrister of the highest rank