philharmonic pitch vs concert pitch

philharmonic pitch and concert pitch both are nouns.

Word	Noun	Adjective	Verb	Adverb
philharmonic pitch	Yes	No	No	No
concert pitch	Yes	No	No	No

As nouns, philharmonic pitch and concert pitch are synonyms defined as:

philharmonic pitch and concert pitch: the pitch used to tune instruments for concert performances; usually assigns 440 Hz to the A above middle C

Other synonyms of philharmonic pitch include international pitch.

philharmonic pitch (noun)	concert pitch (noun)
the pitch used to tune instruments for concert performances; usually assigns 440 Hz to the A above middle C	the pitch used to tune instruments for concert performances; usually assigns 440 Hz to the A above middle C