problem, inquiry

QUESTION
List of words for the clue problem, inquiry from the crossword:
ENQUIRY RESEARCH QUERY TOPIC AGE TRACER EHS ACNE EGO WHY WHA PROBE INVESTIGATION INQUEST HOW ASK SMOG SNAG LEAK
WordClue
TOPICquestion, inquiry
COMPLEXproblem
INQUIRYquestion, problem
PROBLEMquestion, inquiry
COMPLEXproblem
QUESTIONproblem, subject