cotton gin vs gin

cotton gin and gin both are nouns.

Word	Noun	Adjective	Verb	Adverb
cotton gin	Yes	No	No	No
gin	Yes	No	Yes	No

As nouns, cotton gin and gin are synonyms defined as:

cotton gin and gin: a machine that separates the seeds from raw cotton fibers

cotton gin (noun)	gin (noun)
a machine that separates the seeds from raw cotton fibers	a form of rummy in which a player can go out if the cards remaining in their hand total less than 10 points
	a machine that separates the seeds from raw cotton fibers
	a trap for birds or small mammals; often has a slip noose
	strong liquor flavored with juniper berries

cotton gin (verb)	gin (verb)
	trap with a snare
	separate the seeds from (cotton) with a cotton gin