RNA polymerase vs transcriptase

RNA polymerase and transcriptase both are nouns.

Word	Noun	Adjective	Verb	Adverb
RNA polymerase	Yes	No	No	No
transcriptase	Yes	No	No	No

As nouns, RNA polymerase and transcriptase are synonyms defined as:

RNA polymerase (noun)	transcriptase (noun)
the enzyme that copies DNA into RNA	the enzyme that copies DNA into RNA