Is Y silent in yeast?

Listen to both words again: yeast/east. The words yeast and east are both only one syllable in length. They both contain only one vowel sound, the long e. The means that the y sound cannot be a vowel.

How do you speak yeast?

How do you say yeast vs East?

What is the scientific name of yeast pronunciation?

Saccharomyces cerevisiae (boulardii)