Ar vs argon

Ar and argon both are nouns.

Word	Noun	Adjective	Verb	Adverb
Ar	Yes	No	No	No
argon	Yes	No	No	No

As nouns, Ar and argon are synonyms defined as:

Ar and argon: a colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere

Other synonyms of Ar include atomic number 18.

Ar (noun)	argon (noun)
a colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere	a colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere