Db vs dubnium

Db and dubnium both are nouns.

Word	Noun	Adjective	Verb	Adverb
Db	Yes	No	No	No
dubnium	Yes	No	No	No

As nouns, Db and dubnium are synonyms defined as:

Other synonyms of Db include atomic number 105, element 105, hahnium.

Db (noun)	dubnium (noun)
a transuranic element with atomic number 105	a transuranic element with atomic number 105