sermoniser vs preacher

sermoniser and preacher both are nouns.

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

As nouns, sermoniser and preacher are synonyms defined as:

sermoniser and preacher: someone whose occupation is preaching the gospel

Other synonyms of sermoniser include preacher man, sermonizer.

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