fly frame vs simplex machine

fly frame and simplex machine both are nouns.

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

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

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

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

fly 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.