Usage means
1. a customary way of doing something; a custom or practice: the usages of the last 50 years.
2. the customary manner in which a language or a form of a language is spoken or written: English usage; a grammar based on usage rather than on arbitrary notions of correctness.
3. a particular instance of this: a usage borrowed from French.
4. any manner of doing or handling something; treatment: rough usage.
5. habitual or customary use; long-continued practice: immemorial usage.
6. an act of using or employing; use.
and use means
1. to employ for some purpose; put into service; make use of: to use a knife.
2. to avail oneself of; apply to one's own purposes: to use the facilities.
3. to expend or consume in use: We have used the money provided.
4. to treat or behave toward: He did not use his employees with much consideration.
5. to take unfair advantage of; exploit: to use people to gain one's own ends.
6. to drink, smoke, or ingest habitually: to use drugs.
7. to habituate or accustom.