probe

nouns

an inquiry into unfamiliar or questionable activities
"there was a congressional probe into the scandal"
a flexible slender surgical instrument with a blunt end that is used to explore wounds or body cavities
is a type of (narrower)
a medical instrument used in surgery
an exploratory action or expedition
is a type of (narrower)
a careful systematic search
an investigation conducted using a flexible surgical instrument to explore an injury or a body cavity
is a type of (narrower)
systematic investigation to establish facts

verbs

question or examine thoroughly and closely
examine physically with or as if with a probe
"probe an anthill"