ace vs 1

ace and 1 both are nouns.

Word	Noun	Adjective	Verb	Adverb
ace	Yes	Yes	Yes	No
1	Yes	Yes	No	No

As nouns, ace and 1 are synonyms defined as:

Other synonyms of ace include I, one, single, unity.

ace (noun)	1 (noun)
a serve that the receiver is unable to reach	the smallest whole number or a numeral representing this number
one of four playing cards in a deck having a single pip on its face
someone who is dazzlingly skilled in any field
the smallest whole number or a numeral representing this number

ace (adjective)	1 (adjective)
of the highest quality	used of a single unit or thing; not two or more