W: (v) probe [Related to: probe] (question or examine thoroughly and closely)
W: (v) investigate [Related to: investigation] (conduct an inquiry or investigation of) "The district attorney's office investigated reports of possible irregularities"; "inquire into the disappearance of the rich old lady"
S: (n) probe (a flexible slender surgical instrument with a blunt end that is used to explore wounds or body cavities)
S: (n) probe (an exploratory action or expedition)