roving frame vs simplex machine

roving frame and simplex machine both are nouns.

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

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

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

Other synonyms of roving frame include fly frame, speed frame.

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