inbuilt vs integral

inbuilt is not a noun while integral is a noun.

Word	Noun	Adjective	Verb	Adverb
inbuilt	No	Yes	No	No
integral	Yes	Yes	No	No

As adjectives, inbuilt and integral are synonyms defined as:

inbuilt and integral: existing as an essential constituent or characteristic

Other synonyms of inbuilt include built-in, constitutional, inherent.

inbuilt (noun)	integral (noun)
	the result of a mathematical integration; F(x) is the integral of f(x) if dF/dx = f(x)

inbuilt (adjective)	integral (adjective)
existing as an essential constituent or characteristic	of or denoted by an integer
	existing as an essential constituent or characteristic
	constituting the undiminished entirety; lacking nothing essential especially not damaged