warehouser vs warehouseman

warehouser and warehouseman both are nouns.

Word	Noun	Adjective	Verb	Adverb
warehouser	Yes	No	No	No
warehouseman	Yes	No	No	No

As nouns, warehouser and warehouseman are synonyms defined as:

warehouser and warehouseman: a workman who manages or works in a warehouse

warehouser (noun)	warehouseman (noun)
a workman who manages or works in a warehouse	a workman who manages or works in a warehouse