obiter dictum vs passing comment

obiter dictum and passing comment both are nouns.

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

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

obiter dictum (noun)	passing comment (noun)
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
an incidental remark