skilful vs expert

skilful is not a noun while expert is a noun.

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

As adjectives, skilful and expert are synonyms defined as:

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

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

skilful (adjective)	expert (adjective)
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