marriage proposal vs marriage offer

marriage proposal and marriage offer both are nouns.

Word	Noun	Adjective	Verb	Adverb
marriage proposal	Yes	No	No	No
marriage offer	Yes	No	No	No

As nouns, marriage proposal and marriage offer are synonyms defined as:

Other synonyms of marriage proposal include proposal, proposal of marriage.

marriage proposal (noun)	marriage offer (noun)
an offer of marriage	an offer of marriage