expert vs practiced

expert is a noun but practiced is not a noun.

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

As adjectives, expert and practiced are synonyms defined as:

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

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

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

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