h vs Planck's constant

h and Planck's constant both are nouns.

Word	Noun	Adjective	Verb	Adverb
h	Yes	No	No	No
Planck's constant	Yes	No	No	No

As nouns, h and Planck's constant are synonyms defined as:

h and Planck's constant: the constant of proportionality relating the energy of a photon to its frequency; approximately 6.626 x 10^-34 joule-second

h (noun)	Planck's constant (noun)
the 8th letter of the Roman alphabet	the constant of proportionality relating the energy of a photon to its frequency; approximately 6.626 x 10^-34 joule-second
the constant of proportionality relating the energy of a photon to its frequency; approximately 6.626 x 10^-34 joule-second