priest vs spiritual leader

priest and spiritual leader both are nouns.

Word	Noun	Adjective	Verb	Adverb
priest	Yes	No	No	No
spiritual leader	Yes	No	No	No

As nouns, spiritual leader is a hypernym of priest; that is, spiritual leader is a word with a broader meaning than priest:

priest: a person who performs religious duties and ceremonies in a non-Christian religion
spiritual leader: a leader in religious or sacred affairs

Other hypernyms of priest include adult male, man.

priest (noun)	spiritual leader (noun)
a clergyman in Christian churches who has the authority to perform or administer various religious rites; one of the Holy Orders	a leader in religious or sacred affairs
a person who performs religious duties and ceremonies in a non-Christian religion