fly frame vs roving frame

fly frame and roving frame both are nouns.

Word	Noun	Adjective	Verb	Adverb
fly frame	Yes	No	No	No
roving frame	Yes	No	No	No

As nouns, fly frame and roving frame are synonyms defined as:

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

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

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