T    - (TH can be a mutation of T)

Word element	Meaning	Example of use (sound file links underlined)
tafarn, (plural tafarnau)	tavern	Tafarn-y-garreg
tair	see tri
tal	end	Tal-y-bont
tan	end, below
tarren, (plural tarenni)	rocky height, precipice
teg	fair, beautiful	Pant-teg
tir	land, territory	Tirymynach
tomen	mound
ton	grassland, lea	Tonypandy
traeth	strand, beach, shore
trallwng	wet bottom land
traws	cross, transverse; direction, district	Trawsfynydd
tre(f)	homestead, hamlet, town	Tredegar
tri, (feminine tair)	three	Llantrisant
troed	foot	Troed-y-rhiw
tros	over	Trostre
trum	ridge
trwyn	point, cape (literally nose)
twyn	hillock, knoll	Twynllannan
ty, (plural tai)	house	Ty-croes; Tai-bach
tyddyn, ty'n	small farm, holding

  U

Word element	Meaning	Example of use (sound file links underlined)
uchaf	upper, higher, highest	Cwmtwrch Uchaf
uchel	high
uwch	above, over

  Y

Word element	Meaning	Example of use (sound file links underlined)
y, yr, 'r	(definite article) the	Tanygrisiau; Tonyrefail; Godre'r-graig
ych	ox
yn	in
ynys	island, holm, water meadow	Ynysybwl
ysbyty	hospital, hospice	Ysbyty Ifan
ystrad	valley floor, strath	Ystradyfodwg
ystum	bend (in river)	Llanystumdwy