Definition of "interjection"

Some evidence confirming our suspicions that topicalised and dislocated constituents occupy different sentence positions comes from Greenberg (1984). He notes that in colloquial speech the interjection man can occur after dislocated constituents, but not after topicalised constituents: cf. (21) (a) Bill, man, I really hate him (dislocated NP) (21) (b) ✽Bill, man, I really hate (topicalised NP)

1988, Andrew Radford, chapter 10, in Transformational grammar: a first course, Cambridge, UK: Cambridge University Press, page 533

Mnuchin, asked about climate change in a CNBC interview after his comments about Thunberg, argued there were bigger issues that also needed to be addressed. When a host noted clean air rules as an example of something that might be more urgent, Mnuchin ignored the interjection.

2020 January 23, Philip Bump, “Mnuchin said Thunberg needed to study economics before offering climate proposals. So we talked to an economist.”, in Washington Post