matter
conundrum
problem
hitch
trouble
friction
disorder
issue
kink
preventative
From an earlier (m). Only attested in (glossary) ((m), (m)) in the (w). If so, perhaps related to (m), dialectal (m).
A (glossary) of an unknown origin. If so, probably from (m) whence also (m) and dialectal (m).
problem, trouble, issue
(syn)
puzzle
cavity on a tree