soubriquet vs moniker

soubriquet and moniker both are nouns.

Word	Noun	Adjective	Verb	Adverb
soubriquet	Yes	No	No	No
moniker	Yes	No	No	No

As nouns, soubriquet and moniker are synonyms defined as:

soubriquet and moniker: a familiar name for a person (often a shortened version of a person's given name)

Other synonyms of soubriquet include byname, cognomen, nickname, sobriquet.

soubriquet (noun)	moniker (noun)
a familiar name for a person (often a shortened version of a person's given name)	a familiar name for a person (often a shortened version of a person's given name)