simplex machine vs roving frame

simplex machine and roving frame both are nouns.

Word	Noun	Adjective	Verb	Adverb
simplex machine	Yes	No	No	No
roving frame	Yes	No	No	No

As nouns, simplex machine and roving frame are synonyms defined as:

simplex machine and roving frame: a textile machine that transforms the drawn sliver into roving.

Other synonyms of simplex machine include fly frame, speed frame.

simplex machine (noun)	roving frame (noun)
a textile machine that transforms the drawn sliver into roving.	a textile machine that transforms the drawn sliver into roving.