page printer vs page-at-a-time printer

page printer and page-at-a-time printer both are nouns.

Word	Noun	Adjective	Verb	Adverb
page printer	Yes	No	No	No
page-at-a-time printer	Yes	No	No	No

As nouns, page printer and page-at-a-time printer are synonyms defined as:

page printer and page-at-a-time printer: a printer that prints one page at a time

page printer (noun)	page-at-a-time printer (noun)
a printer that prints one page at a time	a printer that prints one page at a time