coupled vs connected

coupled and connected both are adjectives.

Word	Noun	Adjective	Verb	Adverb
coupled	No	Yes	No	No
connected	No	Yes	No	No

coupled (adjective)	connected (adjective)
connected by a link, as railway cars or trailer trucks	joined or linked together
joined together especially in a pair or pairs	plugged in
	being joined in close association
	wired together to an alarm system
	stored in, controlled by, or in direct communication with a central computer