concert pitch vs philharmonic pitch

concert pitch and philharmonic pitch both are nouns.

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

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

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

Other synonyms of concert pitch include international pitch.

concert pitch (noun)	philharmonic 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