linked vs joined

linked and joined both are adjectives.

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

As adjectives, linked and joined are synonyms defined as:

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

Other synonyms of linked include coupled.

linked (adjective)	joined (adjective)
connected by a link, as railway cars or trailer trucks	connected by a link, as railway cars or trailer trucks
	of or relating to two people who are married to each other