desk sergeant vs deskman

desk sergeant and deskman both are nouns.

Word	Noun	Adjective	Verb	Adverb
desk sergeant	Yes	No	No	No
deskman	Yes	No	No	No

As nouns, desk sergeant and deskman are synonyms defined as:

desk sergeant and deskman: the police sergeant on duty in a police station

Other synonyms of desk sergeant include station keeper.

desk sergeant (noun)	deskman (noun)
the police sergeant on duty in a police station	the police sergeant on duty in a police station