In the case of water vapor, it is referred to as «negative lapse rate feedback» and demonstrates a net negative feedback cooling effect from increased water vapor. (92.222.7.6)
For reasons we will discuss later, the best way to measure the water vapor feedback is to combine it with lapse rate feedback. (atmos.albany.edu)
Because the water vapour and temperature responses are tightly coupled in the troposphere (see Section 8.6.3.1), models with a larger (negative) lapse rate feedback also have a larger (positive) water vapour feedback. (ipcc.ch)