"Underlying" is a word in ENGLISH

underlying ENGLISH
Definition:

Lying under or beneath; hence, fundamental; as, the
underlying strata of a locality; underlying principles.

Few words of positivity

I am much less concerned with whatever it is technology may be doing to people that what people are choosing to do to one another through technology. Facebook's reduction of people to predictively modeled profiles and investment banking's convolution of the marketplace into an algorithmic battleground were not the choices of machines.

Douglas Rushkoff

WORD SUGGESTIONS
Laugh your heart out.

How is the Easter Bunny like Shaquille O'Neal? They're both famous for stuffing baskets!

substratum ENGLISH

That which is laid or spread under; that which underlies something, as a layer of earth lying under another; specifically …

Read the complete definition
underlie ENGLISH

To lie under; to rest beneath; to be situated under; as, a stratum of clay underlies the surface gravel.

Read the complete definition