STUMPERS  XCIV

Credit: The Enigma 
NPL Magazine - Nov. 2013
LEXMAN (adapted)

Two nine-letter words differ by their 6th and 7th letters, which are reversed. . The first word is an adjective meaning you are willing to do whatever you are asked or ordered to do. The second word is a noun which means you are unhappy about what you are asked  or ordered to do.

Answers:

COMPLIANT
COMPLAINT