usurpation vs gaining control

usurpation and gaining control both are nouns.

Word	Noun	Adjective	Verb	Adverb
usurpation	Yes	No	No	No
gaining control	Yes	No	No	No

As nouns, gaining control is a hypernym of usurpation; that is, gaining control is a word with a broader meaning than usurpation:

usurpation: wrongfully seizing and holding (an office or powers) by force (especially the seizure of a throne or supreme authority)
gaining control: the act of forcibly dispossessing an owner of property

Other hypernyms of usurpation include capture, seizure.

usurpation (noun)	gaining control (noun)
wrongfully seizing and holding (an office or powers) by force (especially the seizure of a throne or supreme authority)	the act of forcibly dispossessing an owner of property
entry to another's property without right or permission