practiced vs expert

practiced is not a noun while expert is a noun.

Word	Noun	Adjective	Verb	Adverb
practiced	No	Yes	No	No
expert	Yes	Yes	No	No

As adjectives, practiced and expert are synonyms defined as:

practiced and expert: having or showing knowledge and skill and aptitude

Other synonyms of practiced include adept, good, proficient, skilful, skillful.

practiced (noun)	expert (noun)
	a person with special knowledge or ability who performs skillfully

practiced (adjective)	expert (adjective)
skillful after much practice	having or showing knowledge and skill and aptitude
having or showing knowledge and skill and aptitude	of or relating to or requiring special knowledge to be understood