dictum vs obiter dictum

dictum and obiter dictum both are nouns.

Word	Noun	Adjective	Verb	Adverb
dictum	Yes	No	No	No
obiter dictum	Yes	No	No	No

As nouns, dictum and obiter dictum are synonyms defined as:

dictum and obiter dictum: an opinion voiced by a judge on a point of law not directly bearing on the case in question and therefore not binding

dictum (noun)	obiter dictum (noun)
an authoritative declaration	an opinion voiced by a judge on a point of law not directly bearing on the case in question and therefore not binding
an opinion voiced by a judge on a point of law not directly bearing on the case in question and therefore not binding	an incidental remark