#5: I've found the word 'BRAGLORIN', apparently for the sun, which contains the letters 'gol' - ie, golf without its end. I admit I'm not sure how 'bralin' comes out as [endless] cave river, but I figure it's worth a shot.
And I think I can provide an explanation for #7 SORONUME - it's an anagram ('vigorous activity') of UN-MOROSE ('the opposite of depressed'), and is of course a star bird by name.
hS