chief vs secretary

chief and secretary both are nouns.

Word	Noun	Adjective	Verb	Adverb
chief	Yes	Yes	No	No
secretary	Yes	No	No	No

As nouns, secretary is a hyponym of chief; that is, secretary is a word with a more specific, narrower meaning than chief:

chief: a person who is in charge
secretary: a person who is head of an administrative department of government

chief (noun)	secretary (noun)
a person who is in charge	a desk used for writing
a person who exercises control over workers	an assistant who handles correspondence and clerical work for a boss or an organization
the head of a tribe or clan	a person who is head of an administrative department of government
	a person to whom a secret is entrusted

chief (adjective)	secretary (adjective)
most important element