linked vs coupled

linked and coupled both are adjectives.

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

As adjectives, linked and coupled are synonyms defined as:

linked and coupled: connected by a link, as railway cars or trailer trucks

Other synonyms of linked include joined.

linked (adjective)	coupled (adjective)
connected by a link, as railway cars or trailer trucks	connected by a link, as railway cars or trailer trucks
	joined together especially in a pair or pairs