Spectral Analysis vs. Spectral Line Analysis We usually talk about "spectral analysis" but some resources (this paper or this doc) talk about "spectral line analysis".

Does this make sense to you, i.e. are the 2 fields actually different or the 2 names refer to the same thing?
Spectrum analysis is more general: it involves looking at the entire spectrum of a given signal.

Spectral line analysis assumes that the spectrum contains several peaks (lines) of interest at specific frequencies.  The aim then is to find the precise frequency, magnitude, and phase of those peaks (lines).