preacher vs sermoniser

preacher and sermoniser both are nouns.

Word	Noun	Adjective	Verb	Adverb
preacher	Yes	No	No	No
sermoniser	Yes	No	No	No

As nouns, preacher and sermoniser are synonyms defined as:

preacher and sermoniser: someone whose occupation is preaching the gospel

Other synonyms of preacher include preacher man, sermonizer.

preacher (noun)	sermoniser (noun)
someone whose occupation is preaching the gospel	someone whose occupation is preaching the gospel