This pair of sounds are approximant sounds. “W” and “Y”. These consonant sounds are almost vowels.

“W” is made with a tiny “oo” sound and then moves to the vowel which follows it.

“Y” is made with a tiny “I” sound and then moves to the sound that follows it. Phonetically it is written as a lower case letter “j” which is distinct from the letter “Y” because this sound can be hidden in words like:

Use
Beauty and
News