Thanks, diolch

Thatch, to gwellt: toi

Theirs, eiddynt

Thence, oddi yno, o hyny

Thieve, lladrata

Thirst, syched: sychedu

Though, er, er hyny, pe

Thrash, dyrnu

Thread, edau, edafedd: edafu

Threap, ymresymu; ymdaeru