coupled vs linked

coupled and linked both are adjectives.

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

As adjectives, coupled and linked are synonyms defined as:

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

Other synonyms of coupled include joined.

coupled (adjective)	linked (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