Final answer:
The nurse should inform clients about AA for alcohol addiction, NA for substance use disorders, GA for gambling addiction, and clarify that OA mainly supports individuals with overeating issues.
Step-by-step explanation:
A community health nurse involved in supporting clients with alcohol and substance use disorders should be knowledgeable about various support programs that cater to different types of addictions. The appropriate support programs for these conditions are as follows: Alcoholics Anonymous (AA) which assists clients with alcohol addiction by helping them develop a daily recovery program; Narcotics Anonymous (NA) offers support specifically for individuals with substance use disorders other than alcohol; Gamblers Anonymous (GA) provides help for those struggling with gambling addiction. It is important to note that Overeaters Anonymous (OA) actually focuses on individuals with overeating issues, not necessarily those with eating disorders, although the two can sometimes overlap. Engaging in these support groups provides mutual aid and helps individuals achieve and maintain sobriety or abstinence from the behavior they're struggling with.