He also identifies that Loughrigg Fell is the only Lake District fell to share its name with a tarn, although he might have overlooked Scoat Fell (Scoat Tarn) and Bowscale Fell (Bowscale Tarn).
The passage states that Loughrigg Fell is unique in having a name that matches its associated tarn. However, the author may have missed other instances where this occurs, such as with Scoat Fell and Bowscale Fell.