Pahlavi vs Pehlevi language

Pahlavi and Pehlevi language both are nouns.

Word	Noun	Adjective	Verb	Adverb
Pahlavi	Yes	No	No	No
Pehlevi language	Yes	No	No	No

As nouns, Pahlavi and Pehlevi language are synonyms defined as:

Pahlavi and Pehlevi language: the Iranian language of the Zoroastrian literature of the 3rd to 10th centuries

Other synonyms of Pahlavi include Pahlavi language, Pehlevi.

Pahlavi (noun)	Pehlevi language (noun)
the Iranian language of the Zoroastrian literature of the 3rd to 10th centuries	the Iranian language of the Zoroastrian literature of the 3rd to 10th centuries
the script (derived from the Aramaic alphabet) used to write the Pahlavi language
Shah of Iran who was deposed in 1979 by Islamic fundamentalists (1919-1980)