unity vs 1

unity and 1 both are nouns.

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

As nouns, unity and 1 are synonyms defined as:

unity and 1: the smallest whole number or a numeral representing this number

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

unity (noun)	1 (noun)
the quality of being united into one	the smallest whole number or a numeral representing this number
the smallest whole number or a numeral representing this number
an undivided or unbroken completeness or totality with nothing wanting

unity (adjective)	1 (adjective)
	used of a single unit or thing; not two or more