Internal
The word inside interviewing that means to bury is "inter".
on means ontop where in can mean inside
inside
The word into is a preposition. It means to go inside of.
An Anton is a word that means the inside of a molecule
aboard.
a term of driving inside a willa
The four-letter word that means "inside of" is "within." It is commonly used to indicate something contained or enclosed by something else.
The guys orions belt is inside the girls galaxy
In as inside would be naka.
An 8 letter word that means the inside of anything might be "interior." This word has 8 letters and would probably fit your crossword puzzle clue.
Tmesis