考证

考证	kǎo zhèng	to do textual research / to make textual criticism / to verify by means of research (esp. historical details) / to take an exam to get a certificate (abbr. for 考取证件)
考	kǎo	to beat / to hit / variant of 考 / to inspect / to test / to take an exam
考	kǎo	to check / to verify / to test / to examine / to take an exam / to take an entrance exam for / deceased father
证	zhèng	to admonish / variant of 证
证	zhèng	certificate / proof / to prove / to demonstrate / to confirm / variant of 症