subject-matter expert

CONNOISSEUR
WordClue
DIRTunclean matter
FOAMform of matter
GURUexpert, cognoscente
MASSMatter, material
ADEPTguru, expert
STUFFmatter
TOPICsubject
AFFAIRconcern, matter
VACUUMspace that is empty of matter
BIOLOGYThe study of all life or living matter
PROBLEMquestion, subject
SAWDUSTmatter
SUBJECTmatter, topic
QUESTIONsubject, motion
SUBSTANCEPhysical matter
DECOMPOSITIONbreaking down of living matter
TOPICsubject
QUESTIONsubject, motion