pastor vs parson

pastor and parson both are nouns.

Word	Noun	Adjective	Verb	Adverb
pastor	Yes	No	No	No
parson	Yes	No	No	No

As nouns, pastor and parson are synonyms defined as:

Other synonyms of pastor include curate, minister, minister of religion, rector.

pastor (noun)	parson (noun)
a person authorized to conduct religious worship	a person authorized to conduct religious worship