integral part
- essentialFundamentally necessary
- coreCentral essential portion
- fundamentalForming the base
- crucialOf supreme importance
- vitalEssential or sustaining existence
key · component · piece · element · foundation · backbone · cornerstone · building block · fabric · woven · embedded · inseparable · indispensable · necessary · inherent · intrinsic · central · heart
essentiality
integral partaccessory
Supplementary addition
luxury · frill · add-on · afterthought · ornament
connectedness
integral partforeign body
Object in tissue unnaturally
appendage · outlier · bolt-on · attachment · add-on