transcriptase vs RNA polymerase

transcriptase and RNA polymerase both are nouns.

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

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

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