Infiltrate
Part of speech: verb
Definition: To surreptitiously penetrate, enter or gain access. To cause a fluid to pass through a substance by filtration. To send soldiers through gaps in the enemy line.
Example sentence: True terror is a language and a vision. There is a deep narrative structure to terrorist acts, and they infiltrate and alter consciousness in ways that writers used to aspire to.
Penetrate
Part of speech: verb
Definition: Manage to enter into.To insert a penis into an opening, such as a vagina.
Example sentence: Each organism, no matter how simple or complex, has around it a sacred bubble of space, a bit of mobile territoriality which only a few other organisms are allowed to penetrate and then only for short periods of time.