flatwork ironer vs roller ironer

flatwork ironer and roller ironer both are nouns.

Word	Noun	Adjective	Verb	Adverb
flatwork ironer	Yes	No	No	No
roller ironer	Yes	No	No	No

As nouns, flatwork ironer and roller ironer are synonyms defined as:

flatwork ironer and roller ironer: a machine with a large, heated roller that irons and dries sheets, table linens, pillow cases etc.

flatwork ironer (noun)	roller ironer (noun)
a machine with a large, heated roller that irons and dries sheets, table linens, pillow cases etc.	a machine with a large, heated roller that irons and dries sheets, table linens, pillow cases etc.