Research

Part of speech: noun (n.)

Diligent inquiry or examination in seeking facts or principles; laborius or continued search after truth; as, researches of human wisdom. The dearest interests of parties have frequently been staked on the results of the researches of antiquaries. Macaulay.

Synonyms: Investigation; examination; inquiry; scrutiny.

Part of speech: verb (v.)

To search or examine with continued care; to seek diligently.