Crossword Puzzle Noun forms

Clue: Noun forms

Kind of noun (PROPER with 6 letters)
Noun suffix, in Britain (XION with 4 letters)
Rainbow forms (ARCS with 4 letters)
Noun, at times (OBJECT with 6 letters)
It forms part of the border of UCLA's Westwood campus (SUNSETBOULEVARD with 15 letters)
Compound with multiple forms (ISOMER with 6 letters)
RELAPSE into three other forms (PLEASERLEAPERSREPEALS with 21 letters)
Verb that acts as a noun (GERUND with 6 letters)
Two forms of ID for an outback musician? (DIDGERIDOO with 10 letters)
Certain nouns: Abbr. (PLS with 3 letters)