inbuilt vs built-in

inbuilt and built-in both are adjectives.

Word	Noun	Adjective	Verb	Adverb
inbuilt	No	Yes	No	No
built-in	No	Yes	No	No

As adjectives, inbuilt and built-in are synonyms defined as:

inbuilt and built-in: existing as an essential constituent or characteristic

Other synonyms of inbuilt include constitutional, inherent, integral.

inbuilt (adjective)	built-in (adjective)
existing as an essential constituent or characteristic	existing as an essential constituent or characteristic