extension agent vs adviser

extension agent and adviser both are nouns.

Word	Noun	Adjective	Verb	Adverb
extension agent	Yes	No	No	No
adviser	Yes	No	No	No

As nouns, adviser is a hypernym of extension agent; that is, adviser is a word with a broader meaning than extension agent:

extension agent: an advisor employed by the government to assist people in rural areas with methods of farming and home economics
adviser: an expert who gives advice

Other hypernyms of extension agent include advisor, consultant.

extension agent (noun)	adviser (noun)
an advisor employed by the government to assist people in rural areas with methods of farming and home economics	an expert who gives advice