Question

A word which didn't contains any of the vowel sounds​

Answer 1

Cwm and crwth do not contain the letters a, e, i, o, u, or y, the usual vowels (that is, the usual symbols that stand for vowel sounds) in English. But in those words the letter w simply serves instead, standing for the same sound that oo stands for in the words boom and booth.

ʜᴏᴩᴇ ɪᴛ ʜᴇʟᴩꜱ!