Hynafedd, n. seniority
Hynafiad, n. ancestor
Hynafiaeth, n. antiquity
Hynafiaethydd, n. antiquary
Hynaws, a. kind, good-natured
Hynawsedd, n. good-nature
Hynod, a. remarkable, notable
Hwnodiad, n. a making notable
Hynodiaeth, n. notable action
Hynodol, a. notable