Google trends. (2004 to July 2007)

Usability| User experience | Interaction Design | HCI

What people searched for over the last few years.

1. It was obvious, that the word Usability getting less popular over time. But even now, both words are searched for almost equally. With a slight decline in Usability.
2. Interestingly HCI still is searched more than Usability even in July 2017, almost 2 times of that of Usability
3. Word interaction Design definitely losing the audience steadily.