ambassador vs embassador

ambassador and embassador both are nouns.

Word	Noun	Adjective	Verb	Adverb
ambassador	Yes	No	No	No
embassador	Yes	No	No	No

As nouns, ambassador and embassador are synonyms defined as:

ambassador and embassador: a diplomat of the highest rank; accredited as representative from one country to another

ambassador (noun)	embassador (noun)
a diplomat of the highest rank; accredited as representative from one country to another	a diplomat of the highest rank; accredited as representative from one country to another
an informal representative