examination vs investigating

examination and investigating both are nouns.

Word	Noun	Adjective	Verb	Adverb
examination	Yes	No	No	No
investigating	Yes	No	No	No

As nouns, investigating is a hypernym of examination; that is, investigating is a word with a broader meaning than examination:

examination: the act of examining something closely (as for mistakes)
investigating: the work of inquiring into something thoroughly and systematically

Other hypernyms of examination include investigation.

As nouns, investigating is a hypernym of examination; that is, investigating is a word with a broader meaning than examination:

examination: the act of giving students or candidates a test (as by questions) to determine what they know or have learned
investigating: the work of inquiring into something thoroughly and systematically

Other hypernyms of examination include investigation.

examination (noun)	investigating (noun)
the act of examining something closely (as for mistakes)	the work of inquiring into something thoroughly and systematically
the act of giving students or candidates a test (as by questions) to determine what they know or have learned
a detailed inspection of your conscience (as done daily by Jesuits)
a set of questions or exercises evaluating skill or knowledge
formal systematic questioning