warehouseman vs warehouser

warehouseman and warehouser both are nouns.

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

As nouns, warehouseman and warehouser are synonyms defined as:

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

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