concealed vs hidden

concealed and hidden both are adjectives.

Word	Noun	Adjective	Verb	Adverb
concealed	No	Yes	No	No
hidden	No	Yes	No	No

As adjectives, concealed and hidden are synonyms defined as:

Other synonyms of concealed include out of sight.

concealed (adjective)	hidden (adjective)
hidden on any grounds for any motive	difficult to find
not accessible to view	not accessible to view
	designed to elude detection