radium vs Ra

radium and Ra both are nouns.

Word	Noun	Adjective	Verb	Adverb
radium	Yes	No	No	No
Ra	Yes	No	No	No

As nouns, radium and Ra are synonyms defined as:

radium and Ra: an intensely radioactive metallic element that occurs in minute amounts in uranium ores

Other synonyms of radium include atomic number 88.

radium (noun)	Ra (noun)
an intensely radioactive metallic element that occurs in minute amounts in uranium ores	ancient Egyptian sun god with the head of a hawk; a universal creator; he merged with the god Amen as Amen-Ra to become the king of the gods
	an intensely radioactive metallic element that occurs in minute amounts in uranium ores