ἐντός/entos

This word is used to describe an action or situation. It is an adverb.

This word can mean inside. When used this way, this word is used to talk about the inside of an object.
This word can mean among or in the midst of. When used this way, this word is used to talk about being among or in the midst of people.

See: Matthew 23:26; Luke 17:21