atomic number 87 vs francium

atomic number 87 and francium both are nouns.

Word	Noun	Adjective	Verb	Adverb
atomic number 87	Yes	No	No	No
francium	Yes	No	No	No

As nouns, atomic number 87 and francium are synonyms defined as:

atomic number 87 and francium: a radioactive element of the alkali-metal group discovered as a disintegration product of actinium

Other synonyms of atomic number 87 include Fr.

atomic number 87 (noun)	francium (noun)
a radioactive element of the alkali-metal group discovered as a disintegration product of actinium	a radioactive element of the alkali-metal group discovered as a disintegration product of actinium